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Seiji Hokuto (北斗ホクト 星司セイジ Hokuto Seiji) is a character who appears in the 2011 manga, ULTRAMAN. Wearing the Ace Suit, he is the third Ultraman to appear. Initially an independent party who simply mimicked Ultraman to get his revenge on Ace Killer, Seiji eventually joined the SSSP as a full-fledged member.



At some point in the past, Seiji became friends with an extraterrestrial girl named Yuko Minami. Shortly afterwards he was in a plane crash that killed his parents and left him near death, although he was saved by Bemular. He was eventually taken in by Yapool and fitted with prosthetic limbs to replace his damaged organic ones.

Seiji was a young man of Shinjiro's age, going to the same school as the son of Ultraman. However, the two had never interacted in any significant manner until some time after Shinjiro became aware of his heritage. Seiji asked to meet Shinjiro after a class, where he revealed that he knew that Shinjiro was Ultraman, much to the latter's shock. m Later, Seiji ran into Shinjiro again, although Shinjiro received a call from Ide. Seiji used a device to trace the call, confirming his idea of Ultraman's identity. At some point after that, a man attempted to assault and rob him, but Seiji was capable of fighting and beating the man, who was left lying on the sidewalk.

Soon afterwards, Seiji tracked an emergency call, which he declared to be his first case before donning his own Ultraman suit. He quickly arrived at the scene, saving Shinjiro from a Biological Weapon, slicing the beast in half. Seiji's arms then exploded. Just as quickly as he appeared he left, but not before telling Shinjiro that he'd see him at school.

Returning to Yapool, Seiji was given heavy criticism for damaging his arms, but the alien agreed to repair them. He then beat Shinjiro and Moroboshi to defeating a second Biological Weapon in a subway system. After boasting, he tried to be allowed a job at the SSSP, although Moroboshi wanted to check his background. Seiji removed his helmet and explained himself.

The other two Ultramen took Seiji to the SSSP headquarters, where Moroboshi and Edo discussed his alien-designed prosthetics, which were untraceable. Seiji revealed that he had bought the identity of Ultraman from someone, but refused to say who. He was then released, making his way back to Yapool.

Yapool berated Seiji for revealing himself but admitted that they and the SSSP had the same goal in mind, but must keep their savior secret. Seiji agreed, stating that the reason he had been eliminating anyone who interfered with human-alien relations was due to their mysterious savior.

Shinjiro later caught Seiji extorting money from a man who ran a scamming business on the side. The two began to argue about Seiji's position as the "Hammer of Justice," whereupon he challenged Shinjiro to a duel. Using his modified simulation device, he summoned his suit and prepared to fight the suitless Shinjiro. Moroboshi interrupted the one-sided duel, beating Seiji's helmet off with his sword.

Later the young Ultraman arrived to help Shinjiro and Morobishi to defeat the Ace Killer Squad, who were in fact targeting Seiji himself. He challenged Ace Killer, where he managed to hold his own for a while. Eventually the assassin managed to sever one of his prosthetic arms, although Seiji exacted the same treatment on him afterwards.

Ace Killer then drew his hatchet and began to beat, batter and slash Hokuto in a flurry of blows. Seiji managed to recover and fight back, but was stabbed through the chest. He then tackled the mercenary and removed his left hand, revealing a powerful Spacium weapon. Ace Killer resigned himself to his face, and Seiji decapitated him with a blast to the face. Seiji then succumbed to his wounds and dropped into unconsciousness. Bemular then arrived, and carried the wounded young man to safety and to be healed.

Three months later, Seiji appeared with Bemular to save a group of people from an alien in a forest. They then went to New York to fight against the Star of Darkness. The two of them helped Shinjiro hold up a falling building, saving Rena and a group of citizens. Seiji then went to fight against the Star of Darkness' footsoldiers.

Some time later, Seiji was faced by Alien Zarab impostors posing as Shin and Moroboshi in their suits, and was defeated by them. Taro and the Leo Brothers were then sent in to help him.


The Ace Suit (エーススーツ Ēsu Sūtsu) was designed by Yapool to be used by Seiji Hokuto. It is made as an imitation of the authentic Ultraman Suit and as such, its main weapon is also a Spacium Blade, though Ace's is much larger and is used differently. Seiji's prosthetic arms must be switched out when using the Ace Suit, as its weapons are not stored in his civilian-use arms. Being an outsourced suit, the Ace Suit managed to introduce new functionalities, such as thruster-propelled flight and the teleporting mechanism, to the SSSP's suits once Seiji joined the team.


  • Height: 165 cm, 175 with suit
  • Weight: 52 kg, 97 with suit
  • Age: 16 years old

Powers and Weapons

Own Powers

  • Prosthetics: Seiji has mechanical limbs to give him greater combat ability. They use some of the same technology as the Ultraman Suits.
    • Combat Prowess: Despite his thin build, Seiji is a skilled combatant, taking on several school bullies, by himself and winning.
  • Detective Skills/Information Gathering: Seiji is skilled at information gathering, having researched Shinjiro and intercepted a police radio and communication between Ide and Shinjiro.

Via Ace Suit

  • Color Timer: Like Shin's and Shinjiro's suits, Seiji's has a mechanical Color Timer that serves the same main purpose.
  • Spacium Blade (スペシウムブレード Supeshiumu Burēdo): Seiji's suits also sports arm mounted Spacium weapons, but unlike Shinjiro's, they connect with each other to create a blade similar to Ultraman Ace's Ultra Guillotine technique.
  • Flight: Seiji's suit is somehow able to provide flight via thrusters on his back, but they are not designed for long range flight.
  • Beam Gauntlet: The suit's arm somehow reconfigures itself to become a giant beam cannon.
  • Teleportation: When Seiji puts his fists together, a modified Mimicry System teleports the suit onto him, when he expects to go into battle.



  • This Seiji is clearly a reference to Seiji Hokuto and Ultraman Ace.
  • While Shinjiro is heroic and Moroboshi is dark, Seiji is very playful and lighthearted.
  • Seiji's suit was named by himself. The 'A' to represent that it was made by alien tech while the full 'Ace' is a result of his grandstanding.
  • Seiji is not only the youngest of the manga's 'Ultramen', but also the shortest and the lightest.
ULTRAMAN Manga and Anime Characters
Ultramen Ultraman | Shin Hayata (Anime) | Shinjiro Hayata (Anime) | Dan Moroboshi (Anime) | Seiji Hokuto (Anime) | Kotaro Higashi (Anime) | Jack (Anime) | Leo Brothers | Rena Sayama (Anime) | Daigo | Jiro Satsuma
SSSP Mitsuhiro Ide | Edo | Red | Akiko Fuji | Windom
Secondary Characters Bemular (Anime) | Agent Adad (Anime) | Yosuke Endo | Kurata | Shiraishi | Pigmon's Friends | Yapool | Dave | Izumi | Shirou Maki
Star Cluster Alliance Ambassador Mephisto | Alien Awazo | Ubarazu | Alien Valky | Alien Zarab
Aliens/Kaiju Alien Adacic | Alien Igaru | Black King | Alien Kadder | Alien Robuton | Alien Bris | Biological Weapons | Yuko Minami | Alien Awazo | Alien Druz | Sam | Bioweapon Nova | Black King | Alien Magellan Maya
Ace Killer Squad Ace Killer | Alien Nepenthes | Alien Woovelve
Star of Darkness Alien Pedan/Pedant | Rei | Alien Druz | Golden Fortress | Alien Bell/Lleb | Alien Llubihc | Alien Bado | Alien Dealer | Alien Wadoran
Anime Only Shiraishi | Alien Robuton | Alien Pitt | Izumi | Mochigon | Maaya | Esrun
ULTRAMAN: BE ULTRA-exclusive Aliens Alien Mukishibara | Alien Ruboia | Alien Alteric | Alien Exbes | Irindo | Alien Guinpe

Episode Tiga
Alien Ruboia | Zoiger | Gatanothor

Episode Zero
Alien Mukishibara | Iwatesujo | Legionoid | Alien Magellan Maya | Alien Togarame | Alien Exbes | Alien Guinpe

Special Edition
Pedoleon | Magnia | Darkgone | Alien Magellan Maya | Mecha Telesdon II

8U Arc
Darkgone | Hotarunga | Gilanbo | Lethe | Grand King | Space Moths | King Kappa | Mururoa