The series opens with the introduction of the rookie Ultraman Mebius, who is sent to Earth by the Father of Ultra. The series is set 40 years after the shows of Ultraman (Urutoraman, 1966), and makes many references from Ultra Q (1966) through to Ultraman 80 (1988).
Mebius is a rookie Ultra Warrior and has a lot to live up to. He is chosen as the new protector of the earth. This series is set in the same universe as the original timeline; when Mebius first appears to fight a monster, it is mentioned that this is the first time an Ultraman has appeared on earth in 25 years. Under the guise of Mirai Hibino, Mebius joins CREW GUYS, the monster attack force of this series.
At the start of the first episode, all of the original team members of GUYS, save Ryu, are killed off in their first monster battle. Mirai gathers a group of people he meets in an evacuation to join the new GUYS because he feels they have the right heart to be on GUYS.
GUYS (ＧＵＹＳ, Gaizu ): The abbreviated name of Guards for UtilitY Situation. CREW GUYS (ＣＲＥＷ ＧＵＹＳ, Kurū Gaizu ) are the monster attack team (Operational unit) of the series. The general headquarters is located in the office in New York and CREW GUYS is deployed in the headquarters of each country. There is also GUYS OCEAN (ＧＵＹＳオーシャン, Gaizu Ōshan ) which defends the high seas, GUYS SPACY (ＧＵＹＳスペーシー, Gaizu Supēshī ) which defends the space area, and GUYS ANTARCTICA (ＧＵＹＳアンタクティカ, Gaizu Antakutika ) which defends the Antarctic Circle. They have the most advanced technology of any of the past teams in the original universe. The team also have archives containing information of monsters/aliens that had appeared in past series. The name of the document is the same as the defense team of the series in which the monster had appeared. These are: Document SSSP (which refers to monsters and aliens that appeared in Ultraman), Document TDF-UG (Ultra Seven), Document MAT (The Return of Ultraman), Document TAC (Ultraman Ace), Document ZAT (Ultraman Taro), Document MAC (Ultraman Leo), and Document UGM (Ultraman 80), respectively. There is also a category known simply as "Out of Document" (アウト・オブ・ドキュメント, Auto obu Dokyumento ), which contains information on monsters and aliens that appeared when no defense team was present (such as the time before the founding of the Science Patrol and the period between the annihilation of MAC and the founding of the UGM). Their special weapons are an advanced fighter jet that can fly at supersonic speeds, and the capsule monsters. The Maquette Monsters are at first small capsule like items that grow to their full size by using METEOR (メテオール, Meteōru ) (The abbreviated name of Much Extreme Technology of Extraterrestrial ORigin). METEOR's power can only be used for one minute at a time. In the case of a sortie, Sakomizu says "GUYS Sally Go!" (ＧＵＹＳ、サリーゴー！, Gaizu Sarī Gō! ) (When he is absent, Toriyama or Misaki says it), and "G.I.G.!" (Ｇ.Ｉ.Ｇ！, Jī Ai Jī! ) (Guys Is Green) is said in the case of "Roger!"
CREW GUYS Members
- Mirai Hibino/Ultraman Mebius (ヒビノ・ミライ/日比野 未来, Hibino Mirai ): The main character of the series and a member of CREW GUYS. Mirai Hibino may look like a human, but he is Mebius himself instead of using a host, he uses the face of a human he once met in space, and was unable to save. He is an outgoing person and likes to make friends and help people. It is because of him that the current members of team GUYS are members. He divulged his true form to CREW GUYS members in episode 30, though partly due to his choice of appearance, Sakomizu was aware of his identity from the beginning. At the end, he will go back to M78 with Ultraman Hikari. Mebius' personal symbol is the Möbius loop or the infinity sign (as "Mebiusu" is the Japanese transliteration of "Möbius" or "Mebius"). 18 years old.
- Ryu Aihara (アイハラ・リュウ, Aihara Ryū ): He is the only surviving member from the original GUYS. When a monster first appeared, GUYS Japan was sent to take care of the monster. This was the first monster attack in nearly 25 years and no one was prepared for what would come in the battle. Dino Zaur easily defeated his comrades, and the remainder was only the fighter plane of him and Serizawa. Serizawa, not wanting Ryu to die, ejected his seat. He is a good man, but has a cold exterior after what has happened to his friends. When Mirai first meets him, he is reciting the Ultra Five Oaths and Mirai joins in as well. Later on during Mebius' first battle, he berates Mebius for failing to defend the city and shielding himself with buildings, then he berates himself for failing to protect his friends. He feels responsible for all the new members of GUYS and tries his best to protect them. He habitually recites the Ultra Five Oaths after learning them from his previous captain. He was told the history of the country of light by Mirai in episode 30. During Serizawa's final battle as Hikari, Ryu rushes into the battle in a fit of rage at the sight of his former captain being killed. Ryu himself is seemingly killed until it is revealed that Serizawa passed on the Knight Brace to him, allowing him to become Hikari's temporary host. Mirai Hibino/Ultraman Mebius was able to contact him alone in episode 50. Ryu became the new captain of CREW GUYS after episode 50. 20 years old
- Marina Kazama (カザマ・マリナ, Kazama Marina ): She is a former motorcycle racer with dreams of becoming one of the first internationally known women in the sport. She had a supervisor named Kadokura. She still tries to keep up with her practices and team at the same time that she is a member of GUYS. She seems like the older sister of the group and tends to look after the other members a lot: George in particular. She has outstanding hearing and catches the smallest sounds from machines. This hurts the ability to race as it prevents her from pushing her machine to its limit. She is afraid of spiders. She has two younger brothers. Perhaps due to her hearing, Seiji Hokuto/Ultraman Ace was able to contact her alone in episodes 44 and 50. Marina won the motorcycle world championship after episode 50. 19 years old.
- George Ikaruga (イカルガ・ジョージ, Ikaruga Jōji ): He is a former all-star soccer player, though he broke his leg for a time and had to sit out of his games for a few years. He has skill named a shooting star shoot. At the start of the series, a doctor tells him that his knee is finally well enough for him to play soccer again. Ikaruga feels a need to live up to the image that was created for himself, that he is a celebrity and was often looked down upon by his former teammates who think that he has "sold out". He joins GUYS in order to find some form of purpose in his life. As a former soccer player, he has fast eyes and reflexes, which translate into a natural affinity for METEOR-assisted flying, and makes him the only person in the team capable of using the METEOR Shot's 'Amazing Triple Shot' function. He is known to mix Spanish into his Japanese sentences. Although he can swim, he admits he does not wish to be involved in any missions at sea because of bad experiences he has had at sea (And with sea food), and does not wish to be involved in deep-space missions as well. Hideki Go/Ultraman Jack was able to contact him alone in episode 50. After retiring from his previous team, George joined a new football team after episode 50. 20 years old.
- Konomi Amagai (アマガイ・コノミ, Amagai Konomi ): She is a sweet and kind young lady, she used to be a preschool teacher before joining GUYS. Her students cried when she left, but she felt that being a part of GUYS would be the best way for her to be able to protect all of the children that she once taught. It is because of her that all of the future members of GUYS meet up in episode 1, when they try to rescue the rabbits at Konomi's daycare center. She briefly quits GUYS in episode 4 after she scolds herself for lack of valor. Mirai encouraged her, remembering how Ryu had scorned him for collateral damage after fight with Dino Zaur. Marina also encourages her, reminding her that, while she may be at times cowardly, and may cry a lot sometimes, it was Konomi's courage that inspired her and the others to assist her in rescuing the daycare center's rabbits during Dino Zaur's assault. Her kindness shows during the Maquette Monster demonstration, when she was the only member to think of Miclas as 'kawaii' (Cute) when she first saw him, causing also Miclas to 'imprint' to her like she was his mother. She is the only member of the group who wears a mini-skirt and the only member to wears glasses (once, when Konomi dropped the glasses in the Phoenix Nest's swimming pool, Mirai used the glasses to imitate Ultraseven's transformation pose, quickly calling it a "charm"). In episode 16 she stops wearing glasses and gets contact lenses, only to put them back on when no one noticed. In general, she stays at Phoenix Nest as an operator, but goes to the front line as "handler" of the Maquette Monsters when necessary. Dan Moroboshi/Ultra Seven was able to contact her alone in episode 50. Konomi returned to her children friends in the day care school after episode 50. 18 years old.
- Teppei Kuze (クゼ・テッペイ, Kuze Teppei ): He is the heir to a fortune and is always being followed by his mother. He was a medical school student before participating in GUYS. Were he to not participate in GUYS, he would probably have become a doctor in his father's hospital. He is troubled, occasionally hampered, by his mother's worries. He participates in GUYS in order to become independent from his mother, and initially keeps it a secret from her, but she finds out after he appears on television. Although his mother opposes at first, his father's hospital is protected from Insectus by his work, and she gives him her blessing to continue on. He is knowledgeable about the older Ultramen and monsters, to the point that it is his position in GUYS. Hayata/Ultraman was able to contact him alone in episode 50. Teppei became the new doctor of his father's hospital after episode 50. 18 years old.
- Shingo Sakomizu (サコミズ・シンゴ, Sakomizu Shingo ): Commander of the new CREW GUYS and General Inspector of GUYS Japan. Upon assuming his position, he has reorganized GUYS with the new members. He loves coffee. He was once a member of VTOL Space who piloted experimental light speed craft. On a test run 40 years ago to Pluto, his ship was attacked by saucers before Zoffy appeared and rescued him. Although he should be well over 70 years old, the effects of traveling at light speed have greatly prolonged his aging. He has always known that Mebius and Mirai were the same at 40 years old.
 GUYS JAPAN Staff Members
- Aide Toriyama (トリヤマ補佐官, Toriyama Hosakan ): The leader of the Japanese branch of GUYS, he issues orders to GUYS and gets frantic with joy whenever they accomplish a mission. More or less the public face of GUYS, he is apparently the one who must answer to the news media about GUYS' actions. Gave approval for the use of METEOR until episode 4, when he handed the authority to Sakomizu. While generally portrayed as cowardly, syncophantic and bumblingly incompetent throughout the series, he gathers his resolve and stands up to Inspector Shiki when the latter demands that GUYS turn Ultraman Mebius/Hibino Mirai over.
- Secretary Aide Maru (マル補佐官秘書, Maru Hosakan Hisho ): Toriyama's secretary, he follows Toriyama around and often corrects his speech mistakes.
- Yuki Misaki (ミサキ・ユキ, Misaki Yuki ): The acting inspector general (総監代行, Sōkan Daikō ), she reports monsters to GUYS. As with Sakomizu, little is known about her.
- Chief Maintenance Araiso (アライソ整備長, Araiso Seibichō ) The chief of the maintenance group which maintains GUYS machines. He very much prizes a pilot's life. The photographs (Jet VTOL of SSSP, Ultra Hawk 1 of UG, MAT Arrow 1 of MAT, UGM Falcon of TAC, Condor 1 of ZAT and Sky Higher of UGM can be checked) of the main force jets of the monster attack team of successive generations decorates his working area. So, if maintenance of machines is needed, he is the stubborn character which stops sorties. He quarrels with Ryu, who forcibly flies the machines despite the needed repairs. He is the leading person who proposed adoption of METEOR.
- Hinode Sayuri: Lunch lady, working at the Phoenix Nest cafeteria. Often referred 'mother' by several members of GUYS. She was hit by a car when trying to save a boy and was pronounced dead in the hospital. A Serpentian revived her in order to use her body to destroy GUYS base, pretending to be touched by Hinode's selfless actions. In order to keep Hinode under his control, the Serpentian eventually took over her consciousness and body. But before the Serpentian can destroy the base, Hinode regained control of her body and helped fight off the Serpentian invasion force. At the end of the episode we see her going about her life as usual, but now having become both super-strong and super-fast.
- Hiroshi Isana (勇魚 洋, Isana Hiroshi ): He is the commander of GUYS Ocean, posing as an outcast when he first met CREW GUYS Japan. He is also a former member of Chief Maintenance Araiso crew, before he decided to apply as a pilot. He had heard rumors that Ultraman Mebius had joined CREW GUYS as a human and set out to find out who he was. He came upon discovering Mirai and Mebius are the same by only coincidence (he saw Mebius appeared from the jet Ryu and Mirai is in and he realized that the wound on Mirai's chest is also the same part where Mebius got hit by a monster), but he also left them a little note with his farewell gift, stating, "I heard your cockpit conversation, get it?."
GUYS General HeadquartersGUYS General Headquarters is a central part of GUYS in New York.
- Supreme General Chancellor Takenaka (タケナカ最高総議長, Takenaka Saikō Sōgichō ): Appeared in episode 42. He was a staff officer 40 years before Terrestrial Defense Force. Grandfather of Aya and Takato Jinguji.
- Kazuya Serizawa/Ultraman Hikari (セリザワ・カズヤ, Serizawa Kazuya ): Serizawa was the former commander of GUYS. When Dino Zaur invaded the Earth, then-captain Serizawa had Ryu eject from their jet while he made a suicide run at Dino Zaur high above the earth. However, just before dying, Hunter Knight Tsurugi united with him. After destroying Dino Zaur Reverse, he was asked by Mirai to return, an offer which he refused and told Mirai to take care of Ryu in his absence as he left the Earth. In episode 35, he returns to Earth after an imposter attacks it in his form. He fights the imposter, the alien Babarue, and after winning he returns to space. Hikari's power was inherited to Ryu in Episode 49.
- Mystery Woman (Bogal Human) (謎の女（ボガールヒューマン）, Nazo no Onna (Bogāru Hyūman) ): She came to Earth to aid the monsters attacking the planet and was actually a monster herself. Her true form was Bogal the Higher Dimension Predator. Her aliform acted like a Venus flytrap, and she had an elastic tongue. Her human form was dressed completely in white and has a reptile-like tongue. She talked in a lizard-like voice, could teleport and can move at super-speed. After she destroyed the planet of Arb, Tsurugi came to kill her. She was a bit of a coward, as she always teleported when Tsurugi attacks her. She caused Mebius much trouble. When Mebius used his Mebium Beam to destroy her, she shed her skin and became Bogal Mons. She fought both Mebius and Tsurugi in this form, and was ultimately destroyed when Tsurugi lodged his Knight Blade into her torso long enough for the energy to accumulate. The resulting explosion covered the entire island that they were on, but Mebius and a dying Tsurugi managed to escape before a force field that CREW GUYS set up earlier to contain the explosion could trap them inside.
- Kadokura (カドクラ, Kadokura ): The supervisor of the team to which Marina belonged. At first, although he regretted having left the team in order that Marina might join GUYS, he is aiding now.
- Keiko Kuze (クゼ・ケイコ, Kuze Keiko ): Teppei's mother. She is very overprotective of Teppei. She expects Teppei to succeed the top position in his father's hospital. She was unaware that Teppei was a member of GUYS, but found out when she saw him in a news report on television. She was very much opposed to Teppei continuing being part of the GUYS team, until she observes him in action, defending his father's hospital from a monster. After Teppei finally admits to his reasons for wishing to stay as a member of GUYS, she gives him her blessing.
- Tetsuharu Kuze (クゼ・テツハル, Kuze Tetsuharu ): Teppei's father. He is the head doctor of a hospital.
- Chisato (チサト, Chisato ): She is the nurse who was Konomi's coworker.
- Tetsuro Ban (バン・テツロウ, Ban Tetsurō ): He was the captain of Spacecraft Arandas. Appeared in episodes 21 and 22. The father of Hiroto. His wife was killed by Namegon. His son was killed when they entered the Ultra Zone in their spacecraft. He is now retired and spends his days remembering his time as a captain. He originally was opposed to Mirai using the form of his son but soon accepted this as a way to honor his son's bravery.
- Hiroto Ban (バン・ヒロト, Ban Hiroto ): He was a member of the Spacecraft Arandas along with his father, Mirai Hibino's exact look-alike. He was born on Mars and had never been to earth. One day his father asked him to join him on a mission to earth, an offer which he accepted. He was bringing his mother's ashes home to earth. Along the way, the ship encountered distress. Ban sacrificed himself to save the ship. He entered the Ultra Zone where he was killed before they could reach Earth. After saving his father, Mebius used the form of his son as his human guise to honor Ban's bravery.
- Professor Asami Fujisawa (フジサワ・アサミ博士, Fujisawa Asami Hakase ): A genius who skipped most grades and acquired a degree at age 20. She created the Region Restrictor and Dimensional Dissolver. She is best friends with Misaki. Due to Asami' light character and love of Spanish Flamenco dancing, George falls in love with her. She has a strong dislike of coffee (unlike Sakomizu), and will automatically suspect of Sakomizu if she even smells any nearby.
- Mitsuhiko Hirukawa (蛭川 光彦, Hirukawa Mitsuhiko ): He is the journalist of a gossip weekly magazine. In the past, he wrote the falsehood news story of the reason by which George joined the GUYS. In episode 28 he engineers a meeting between Konomi and a childhood friend of hers in order to gain access to the Phoenix Nest and gather 'dirt' on their members. Later, he finds out that Mirai is indeed Ultraman Mebius in episode 44. He reveals this later in television talk show.
- Man in Black (黒ずくめの男, Kurozukume no Otoko ): He is Yapool's human form. Mushitaro Kuri who sold his soul to Yapool in the past was made into a puppet.
- Aya Jinguji (ジングウジ・アヤ, Jingūji Aya ): She is the genius oceanographer who appeared also in Ultraman Mebius & Ultraman Brothers. She is Supreme General Chancellor Takenaka's granddaughter. She appears to have a 'crush' on Mirai.
- Inspector Shiki (シキ査察官, Shiki Sasatsukan ): He is the inspector of National Security Agency. He demands that Mirai be handed over to the police after finding out he is Mebius.
- Ultraman Mebius (ウルトラマンメビウス, Urutoraman Mebiusu ): Rookie of the space garrison who came to the earth after being told to protect it by Ultra Father. He became a human named Mirai Hibino. He uses the Mebius Brace and the call of "Mebius!" to change into his true Ultra form. When he was younger, Ultraman Taro personally taught him how to fight. He prevented Dino Zaur's attack using buildings as a shield in Episode 1. Due to this, the city was nearly destroyed in the first episode, and Ryu berated him for this. On his way to Earth, he encountered a ship that was being swallowed by the Ultra Zone. Hiroto Ban, his father and crew were in this ship. Hiroto Ban tried to help his father and crew escape, despite his best efforts, the container which held Hiroto was swallowed completely, and the Ultra Zone then disappeared. Mebius was touched by Hiroto's actions and took his human form as his disguise. At first, Tetsuro was perplexed by this but eventually let Mebius use his son's form.
- Mebius Brave (メビウスブレイブ, Mebiusu Bureibu ): Makes its first appearance in episode 18. By using the Knight Brace left to him by Ultraman Hikari, he was able to reach this new form. This form looks the same as his basic form save for the fact that it has a gold "V" line running along the chest and arms, much like Ultraman Gaia and Agul's V2 forms respectively save for the fact that they have a black "V" line along the chest. In episode 35, since the Knight Brace was returned to Hikari, Mebius lost the ability to use this form.
- Mebius Burning Brave (メビウスバーニングブレイブ, Mebiusu Bāningu Bureibu ): Makes its first appearance in episode 30. By his friends wanting him to be safe, their power granted Mebius a new form. It has a gold fire symbol line running along the chest, abdomen and upper arms, and the area where an ear is red increased. And the bodily red pattern became like conventional Ultraman. After battles, he can change back into his default state very quickly without flashing. Mebius is also more stronger physically in this form (Shown when he fought Gomora).
- Mebius Phoenix Brave (メビウスフェニックスブレイブ, Mebiusu Fenikkusu Bureibu ): This form appears in the final episode. Together with the other members of GUYS, Mirai and Ryu combine their souls and are able to become this form. This form's physical appearance is similar to Ultraman Gaia's Supreme Form, save for the fact that Mebius has gold phoenix lines on his suit and does not appear to be muscular like Gaia.
- Mebius Infinity (メビウスインフィニティー, Mebiusu Infinitī ): This form only appeared in Ultraman Mebius & Ultraman Brothers. By combining the powers of all the Ultra Brothers plus Zoffy, Mebius is able to reach this form to defeat U-Killersaurus Neo. The silver lines running along his body become dark in color, and is somewhat rougher.
- Ultraman Hikari (Ultraman Light) (ウルトラマンヒカリ, Urutoraman Hikari ): First appears in Episode 5. He was an excellent scientist who belonged to Space Science Technology Bureau. The true identity of Hunter Knight Tsurugi (Sword the Hunter Knight) (ハンターナイト ツルギ, Hantā Naito Tsurugi ), sans armour and with Star Marks (Medals of Honor to the Ultra Race) on his chest similar to Zoffy. After Tsurugi sacrifices himself to save Mebius and gets his revenge on Bogal, who had destroyed the planet of Arb, Ultra Mother destroys the Arb Gear (アーブギア, Ābu Gia ) known as the Armour of Vengeance (復讐の鎧, Fukushū no Yoroi ), which Tsurugi acquired while unleashing his anguish over failing to protect the planet, and restores Hikari to his former self, coming back to Mebius in the midst of his fight with Dino Zaur Reverse. Since then, he operates independent from GUYS with Serizawa acting as his host. His name comes from Ryu of CREW GUYS to the dismay of the rest of the team at first before Mirai vouches for him. After he was able to escape to Gromite, Zoffy appeared before him. Although Zoffy told him to return to the Land of Light, he refused. He stood by his desire of staying on Earth and Zoffy eventually relented. After extinguishing Salamandora in Episode 17, he gave the Knight Brace to Mebius. After he had one final talk with Ryu and GUYS, he left the Earth to go to the Land of Light. In Episode 35, he returns to the Earth in pursuit of Alien Balbalu, a shape-shifting being disguised at the time as Tsurugi, but by the time he arrived, Alien Balbalu had already managed to ruin Hikari's reputation. He returned to Earth with the Armor of Heroes (勇者の鎧, Yūsha no Yoroi ), an exact copy of the Armor of Vengeance, but now calls himself Ultraman Hikari in this form. After he talked with Mirai by telepathy, the Knight Brace was returned to him. After inflicting a wound on Alien Empera using Zamushar's Seizamaru, Hikari's power was inherited to Ryu from Serizawa.
- Father of Ultra (ウルトラの父, Urutora no Chichi ): He appears in Episodes 1, 27, 29 and 37. 160,000 Earth years old. Commander of the Space Garrison. He is Taro's father, Ace's adoptive father, the uncle by marriage of Seven and his elder siblings, and husband of the Mother of Ultra (who is the younger sister of Seven's late mother). Mebius received his Brace from Ultra Father and was ordered to go to Earth by him as well. At his age, Ultra Father can't fight for long. He appears on earth first in 1972 and 2006 in order to help Mebius who became a golden statue thanks to Jashrine's attack in episode 37.
- Mother of Ultra (ウルトラの母, Urutora no Haha ): She appears in Episodes 10, 11, 27 and 29. 140,000 Earth years old. Commanding officer of the Silver Crusaders, a medical support team for the Space Garrison. She is Taro's mother, Ace's adoptive mother, the aunt of Seven and his elder siblings (as she is the younger sister of Seven's late mother), and wife of the Father of Ultra. She helped Tsurugi regain his true form of Hikari. First appeared on Earth in 1973.
- Zoffy (ゾフィー, Zofī ): He appears in Episodes 15, 24, 42 and 50. 25,000 Earth years old. Commanding officer of the Space Garrison and the rumored grandson of Ultraman King, who is the 200,000-plus-year-old ruler of Planet King. In Episode 15, he warned Hikari that working alongside Mebius while not being in the Space Garrison would cause problems. He had a telepathic contact and hosted temporarily by GUYS' captain Shingo Sakomizu.
- Ultraman/Shin Hayata (ウルトラマン／ハヤタ・シン, Urutoraman/Hayata Shin ): He appears in episode 47 and 50. 20,000 Earth years old. He first appeared on Earth 40 years ago (1966). His host is Hayata Shin, a former member of SSSP. Had a telephatic contact with GUYS' member Teppei Kuze in episode 50.
- Ultra Seven/Dan Moroboshi (ウルトラセブン／モロボシ・ダン, Urutorasebun/Moroboshi Dan ): He appears in episode 46 and 50. 17,000 (or 19,000) Earth years old. Nephew of the Mother of Ultra and, by marriage, the Father of Ultra, and first cousin of Taro and, by adoption, Ace. He first appeared on Earth 39 years ago (1967) using a copy of adventurer Jiro Satsuma and the name Dan Moroboshi. A former member of TDF-UG and former captain of MAC. Befriended GUYS' member Konomi Amagai, with whom he had telepathic contact in episode 50.
- Ultraman Jack (The Return of Ultraman)/Hideki Go (ウルトラマンジャック (帰ってきたウルトラマン)／郷 秀樹, Urutoraman Jakku (Kaettekita Urutoraman) /Gō Hideki ): He appears in episode 45 and 50. 17,000 (or 19,000) Earth years old. He first came to Earth 35 years ago (1971). His host is Hideki Gō, a former member of MAT. He had a telepathic contact with GUYS' member George Ikaruga in episode 50.
- Ultraman Ace/Seiji Hokuto (ウルトラマンエース／北斗 星司, Urutoraman Ēhsu/Hokuto Seiji ): He appears in episode 44 and 50. 15,000 years old. Ace appears in February and first came to Earth 34 years ago (1972). His host is Seiji Hokuto, and he also had Yuko Minami in conjunction with Hokuto until she departed for her home in the moon. He's a former TAC member. Near the end of episode 44, Seiji and Yuko meet up again. Seiji had a telepathic contact with GUYS' member Marina Kazama in episodes 44 and 50.
- Ultraman Taro (ウルトラマンタロウ, Urutoraman Tarō ): He appears in episodes 24, 29, 30 and 50. 12,000 Earth years old. The son of the Father and Mother of Ultra, brother by adoption of Ace, and first cousin of Ultraseven. He appeared in Earth 33 years ago (1973) and had Kotaro Higashi, a ZAT member, as his host. When Mebius was younger, he was the closest to him and trained him to fight. He came to Earth to rescue Mebius, who disobeyed the return command and fought with Imperiser. Originally, he was supposed to fight on Earth in place of Mebius but felt that it was a mission better fit for his youngest brother.
- Ultraman Leo/Gen Otori (ウルトラマンレオ／おゝとり ゲン, Urutoraman Reo/Ōtori Gen ): He appears in episode 34 and 50. 10,000 Earth years old. Along with his younger identical twin brother Astra, he is the only known survivor of the destruction of their birthplace L77, which was ruled by their parents and destroyed by Alien Magma. He appeared in earth 32 years ago (1974). He is known as Gen Hotori and was a member of MAC alongside Dan Moroboshi (Ultra Seven) back then. He stated to Mirai that, although the other Ultra Brothers consented, he could still not accept Mebius as a protector of his 'adopted homeworld' after defeating Mebius in single combat, and requested Mebius prove himself by training himself to defeat Alien Reflect.
- Astra (アストラ, Asutora ): He appears in episode 50 and was mentioned in episode 35 when Teppei was reading out the records of Alien Barbarue. Leo's younger twin brother. Same age as his elder twin brother (10,000 Earth years old). Together, the Leo Brothers can form a powerful attack called the Ultra Double Flasher. Astra does not have a human form.
- Ultraman 80/Takeshi Yamato (ウルトラマン８０／矢的 猛, Urutoraman Eiti/Yamato Takeshi ): He appears in episode 41 and 50. 8,000 Earth years old. He was the last Ultra to appear before Mebius came to Earth, which was in 1980. He has an implied girlfriend, Yullian, an Ultrawoman who makes a cameo appearance in episode 1. Following the beast known as Roberger II, 80 arrives on Earth once again. He later appears at a private class reunion in Sakuragaokaka junior high school as he was their ex-teacher. A former member of UGM.
- Phoenix Nest (フェニックスネスト, Fenikkusu Nesuto ) - It is the base of GUYS JAPAN. The base keep digital records from previous defense organizations (SSSP, TDF-UG, MAT, TAC, ZAT, MAC, UGM) which can be retrieved by clicking at their respective on-screen insignia. Unlike several past bases, it has various functions as carrier base. It changes and flies to Flight Mode. Flight Mode makes its first appearance in episode 26. Flight Mode uses the Dimensional Dissolver beam of METEOR which closes the gate of a different dimension semipermanently, and Phoenix Phenomenon which destroys the time-space wave generating equipment. It was greatly damaged by Alien Empera.
- Gun Crusader (ガンクルセイダー, Gan Kuruseidā ) - The fighter jet of the old GUYS. This was the jet that Serizawa and Ryu had been on during episode 1.
- Gun Crusader MX (ガンクルセイダーＭＸ, Gan Kuruseidā Emu Ekkusu ) - Makes its first appearance in episode 49. MX is METEOR EXPERIMENTAL. The METEOR-type Gun Crusader which was safekeeping as the spare of Gun Phoenix Striker. It was easily destroyed by Alien Empera.
- Gun Speeder (ガンスピーダー, Gan Supīdā ) - A small multi-core pod that becomes the cockpit of the GUYS Gun-type jets. Capable of simple flight and deep sea diving. Four of 1, 2, 3 and EX are stored in Phoenix Nest. Respectively, the color of a nose of an airplane is different. It uses a beam and Phonon Maser of a sound wave gun.
- Gun Phoenix (ガンフェニックス, Gan Fenikkusu ) - The omnipotent separating fighter jet that serves as the backbone of GUYS' anti-monster arsenal. Separates into Gun Winger and Gun Loader.
- Gun Winger (G-WGR) (ガンウィンガー, Gan Wingā ) - An attack fighter jet excelling in high-speed air battles. Forms the front half of the Gun Phoenix. The main attacks are Beak Valcan of a nose of an airplane, and Winglet Blaster of the main wings. Maneuver Mode can use Phantam Aviation (All jets use it) which develops Inertial Wings, makes the other self and performs a super-movement, and Specium Warhead Missiles. however, since power is lower than Specium Ray of Ultraman, it is necessary to carry out a plural hit. Magnerium Medicaliser was used for Mebius who froze.
- Gun Loader (G-LDR) (ガンローダー, Gan Rōdā ) - A multiuse heavy fighter jet. Forms the rear half of the Gun Phoenix. The main attacks are Variable Pulser of a nose of an airplane, and Double Gun Launcher of the horizontal stabilizer. Maneuver Mode can use Bringer Fan which makes a tornado to lift and throw monster, and Ventilation Volteccer which applies it and blows away fog and a toxic gas, and Maxwell Tornado which makes a tornado of a flame.
- Gun Booster (G-BST) (ガンブースター, Gan Būsutā ) - Makes its first appearance in episode 15. It excels as a high-speed pursuit. Maneuver Mode can use Spiral Wall which carries out the high-speed rotation of the fuselage, and flips and defends an attack, and Gatling Detonator which carries out the salvo fire of the beam cannon of six gates of both wings.
- Gun Phoenix Striker (ガンフェニックストライカー, Gan Fenikkusutoraikā ) - Makes its first appearance in episode 21. A fighter jet that is the result of Gun Booster combining with the Gun Phoenix, enabling a more powerful boost function. The final attack is Valiant Smasher, discharging a beam from all gunports. Maneuver Mode can use Invincible Phoenix which shines the fuselage and fires the Gun Phoenix Striker-like energy wave. It was destroyed by Alien Empera.
- Sea Winger (S-WGR) (シーウィンガー, Sī Wingā ) - Makes its first appearance in episode 38. It is Gun Winger of GUYS OCEAN. The main attack is the same as Gun Winger, and Maneuver Mode can use Specium Trident. It has WISE(Wing In Serface Effect) -Cruising function which can glide through the seas' surface and can dive to 100 m.
- Blue Whale (ブルーウェイル, Burū Weiru ) - Makes its first appearance in episode 38. It is the command base of CREW GUYS OCEAN.
- A Fateful Encounter (運命の出逢い, Unmei no Deai )
- Our Wings (俺達の翼, Oretachi no Tsubasa )
- Only One Life (ひとつきりの命, Hitotsu kiri no Inochi )
- Broken Bonds (傷だらけの絆, Kizudarake no Kizuna )
- Reverse Shot (逆転のシュート, Gyakuten no Shūto )
- Two From the Deep Sea (深海の二人, Shinkai no Futari )
- Fanton's Lost Item (ファントンの落し物, Fanton no Otoshimono )
- Terrible Predator (戦慄の捕食者, Senritsu no Hoshokusha )
- Armour of Vengeance (復讐の鎧, Fukushū no Yoroi )
- Pride of GUYS (GUYSの誇り, Gaizu no Hokori )
- Mother's Miracle (母の奇跡, Haha no Kiseki )
- The First Errand (初めてのお使い, Hajimete no Otsukai )
- Marina of the Wind (風のマリナ, Kaze no Marina )
- One Path (ひとつの道, Hitotsu no Michi )
- Phoenix Nest (不死鳥の砦, Fushichō no Toride )
- A Strong Man from Space (宇宙の剣豪, Uchū no Kengō )
- Formation of Our Vow (誓いのフォーメーション, Chikai no Fōmēshon )
- Pressure on Ultraman (ウルトラマンの重圧, Urutoraman no Jūatsu )
- The Isolated Grandstand (孤高のスタンドプレーヤー, Kokō no Sutando Purēyā )
- Connecting Message (総監の伝言, Sōkan no Dengon )
- Cry From Space (虚空の呼び声, Kokū no Yobigoe )
- Daily Future (日々の未来, Hibi no Mirai )
- Ocean Waves of Time (時の海鳴り, Toki no Uminari )
- Yapool's Rebirth (復活のヤプール, Fukkatsu no Yapūru )
- The Program of the Poisonous Moth (毒蛾のプログラム, Dokuga no Puroguramu )
- Flying to Tomorrow (明日への飛翔, Asu e no Hishō )
- Champion of the Fierce Fight (激戦の覇者, Gekisen no Hasha )
- Konomi's Treasure (コノミの宝物, Konomi no Takaramono )
- Day of Separation (別れの日, Wakare no Hi )
- The Flame of Promise (約束の炎, Yakusoku no Honō )
- Thoughts Of Friends (仲間達の想い, Nakamatachi no Omoi )
- The Monster Master's Legacy (怪獣使いの遺産, Kaijūtsukai no Isan )
- Lady of the Blue Fire (青い火の女, Aoi Hi no On'na )
- A Man Without a Home (故郷のない男, Furusato no Nai Otoko )
- An Azurite Light and a Shadow (群青の光と影, Gunjō no Hikari to Kage )
- Mirai's Younger Sister (ミライの妹, Mirai no Imōto )
- Father Returns (父の背中, Chichi no Senaka )
- Isana of the Ocean (オーシャンの勇魚, Ōshan no Isana )
- An Invincible Mother (無敵のママ, Muteki no Mama )
- Lonely Paradise (ひとりの楽園, Hitori no Rakuen )
- Teacher's Memories (思い出の先生, Omoide no Sensei )
- An Old Friend's Visit (旧友の来訪, Kyūyū no Raihō )
- Threatening Mebius-Killer (脅威のメビウスキラー, Kyōi no Mebiusu Kirā )
- Ace's wish (エースの願い, Ēsu no Negai )
- Deathrem's Plan (デスレムのたくらみ, Desuremu no Takurami )
- Immortal Glozam (不死身のグローザム, Fujimi no Gurōzamu )
- Mephilas's Game (メフィラスの遊戯, Mefirasu no Yūgi )
- Advent of The Emperor -Final Trilogy I- (皇帝の降臨 ―最終三部作Ⅰ―, Kōtei no Kōrin -Saishū Sanbusaku Wan- )
- Dark Clouds of Despair -Final Trilogy II- (絶望の暗雲 ―最終三部作Ⅱ―, Zetsubō no An'un -Saishū Sanbusaku Tsū- )
- Words from the Heart -Final Trilogy III- (心からの言葉 ―最終三部作Ⅲ―, Kokoro kara no Kotoba -Saishū Sanbusaku Surī- )