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The Leo Brothers (レオ兄弟 Reo Kyōdai), namely Leo (レオ Reo) and Astra (アストラ Asutora), are characters in the ULTRAMAN manga series. They a pair of assassins employed by the Star Cluster Alliance, said to be even more skilled than Ace Killer.



The last survivors of Planet L77, the Leo Brothers were trained as assassins at a young age. When their planet was destroyed during their childhood, they found a place with the Star Cluster Alliance. Though some members of the council felt that the brothers were too uncontrollable, they performed their job as hitmen for many years.

The Leo Brothers made their first appearance on Earth upon being summoned by the Star Cluster Alliance. They were sent to Hong Kong to kill Agent Adad as well as the illegal aliens he was sheltering, for knowing too much about their secret plans. The brothers tracked down their target and engaged him in combat, managing to overpower the agent at first. However, Adad took a pill and transformed into a massive, hulking version of himself. Adad's increased power forced the brothers to revert to their true forms, where they managed to injure their target. Despite this, Adad's friend Sam rushed to his defense and attempted to shoot Astra.

Before the brothers could kill Sam, Dan Moroboshi appeared with Windom. Angered, Astra charged Windam, but was shot down and incapacitated by the robot. Adad regenerated from his injuries as Leo and Moroboshi traded threats, preparing to battle. Moroboshi, fueled by vengeance after his experiences in New York, was merciless against them and extorted them for information by holding Astra hostage. They were unprepared for the sudden emergence of Nova, sent by the Star Cluster Alliance to dispose of everyone involved.

Leo begged for Moroboshi to at least spare Astra as he was the only family he had left. Having a change of heart after being reminded of Rei, Moroboshi let Astra loose and they fought Nova together with Shinjiro Hayata as backup, managing to kill it by blasting its head with two Spacium Beams. The Leo Brothers then pledged their allegiance to Moroboshi for helping them.

Soon, the Leo Brothers revealed to the SSSP that the Star Cluster Alliance's speech about the Space Contraction Phenomenon was nothing more than a lie, and their true motives involved revenge against the Ultra race, seeing them as vigilantes who impose their sense of order upon other species, eliminating those who did not comply. These revelations shook the SSSP members, especially Shinjiro.

They were later sent out to help Seiji Hokuto and Taro fight against two Alien Zarab impostors who were imitating Moroboshi and Shin Hayata to cause destruction and defame the name of Ultraman.


Powers and Weapons
  • Super Human Physicality: In their human forms the brothers are able to compete with Adad, whose strength is approximate to Moroboshi's when he wears his Ultra Suit. In their true forms, they are able to overpower Adad easily
  • Short-Range Teleporters: The Leo Brothers use short-range teleporters to give the appearance of rapid movement.
  • Transformation: The Leo Brothers are capable of a limited form of shapeshifting, giving them an almost-human appearance. When they shed this disguise, their combat ability goes up.



  • Unlike their inspirations, the Leo Brothers in the manga are villainous with more similarities to the Alien Magma than the Ultras.
  • Leo and Astra have what appears to be a bracelet.
    • Their armors also contain small-shaped holes in the upper chest armor based upon their counterparts. (circular for Leo and rectangular for Astra respectively)
  • The Leo Brothers relationship with Dan is likely based on the mentor-student relationship of the original Dan and Gen.
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