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Guiro I
Home world: Planet Guiro
First appearance: Ultraman Leo Episode 9: Bridge of Friendship That Spans Space (1974)
Latest appearance: None
Height: 59 m
Weight: 25,000 t
Category: Aliens
Affiliation: Beryudora (Body Part)
Roar(s): TBA

Guiro (ギロ Giro?) was an alien that appeared in the TV series Ultraman Leo. He appeared in episode 9.

Subtitle: Space Star Beast (宇宙星獣 Uchū Boshi-jū?)


  • Height: 2.1 m - 59 m
  • Weight: 90 kg - 25,000 t
  • Origin: Planet Guiro


Ultraman Leo

Coming to Earth without the intention of an invader, Guiro worked himself on the Monster Park, a section of an amusement park where monsters that defeated by preceded Ultras had been made for attraction. One day, he met Toru as the boy was hypnotized gave him an ice cream. While Gen and his friends happily watched the monster attractions, suddenly he detected Guiro as an alien, since he was seen eating an ice cream compared to other costume monsters and thanks to Gen's true nature as an Ultra, Guiro and Toru ran away from Gen. As Gen successfully tailed them with a truck, Guiro fired a white goo from his antennae and grew large out of rage. With Toru stucked on among Guiro's scales, Gen transformed into Leo and fight. Despite both Leo and Guiro's strength were on par, the alien made his escape.

Later, MAC crews arrived to the amusement park, where Guiro and a hypnotized Toru played in a Carousel. Despite MAC aimed for Guiro, however the alien escaped to his own realm. Toru was sent to hospital for treatment but the alien played with him again, bring him to his realm. While Dan was busy training Gen, they were alerted that Toru had disappeared from his ward. At night, Guiro in his giant form detected at a city as MAC were sent to attack him, unaware that Toru was stucked among Guiro's scales again. After Gen finished his training, he transformed into Leo and attacked Guiro. However, Toru ordered him to stop, not wanting his new friend to die. Guiro later fired his sticky foam to Leo but the Ultra spin himself in the mid-air to escape from it. With the combined firepower from MAC fighter jets to distract the alien, Leo kicked Guiro on the back, freeing Toru from his scales and catch the boy just in time to put him into safety. Toru was forced to watched in horror when Leo chopped both of Guiro's antennas, killing the alien in process. As everybody went to Guiro's dead body, now reduced to human-size, Toru expressed his anger as the alien's reign of terror was only out of his fright for humans. Gen step back from the crowd and transformed into Leo again and revive Guiro by regrowing his antennas. Guiro bids farewell to Toru and leave to the outer space.


  • Designer: Osawa Tetsuzo
  • Guiro just likes ice cream and candy and he won't do any harm except if anybody attack him, as Toru reveal when he unconscious.
  • Although not physically seen, Guiro is one of the kaiju that makes up Beryudora's body in Mega Monster Battle: Ultra Galaxy Legend The Movie.

Powers and Weapons

  • Warm Shower: Guiro can emit a stream of white foam from his antennas, solidify the target in contact. 
  • Hypnosis: Guiro can perform a weak hypnosis on a target.
  • Teleportation: When needed, Guiro can teleport long distances.
  • Realm: Guiro can create his own realm where it also allow its residence to levitate on their own.
  • Size Change: Guiro can change his size from that of a human’s to that of a giant monster.


If his antennas are chopped, he will die.


Ultraman Leo Kaiju & Seijin
Red Giras | Black Giras | Alien Magma | Alien Tsuruk | Kanedoras | Alien Karly | Kendoros | Vekira | Guiro | Ron | Alien Kettle | Bango | Alien Vibe | Antales | Alien Flip | Alien Atler | Alien Wolf | Bat Girl | Batton | Alien Boze | Bock | Dogyuh | Alien Alpha | Northsatan | Garon | Littre | Alien Coro | Renbolar | Carolyn | Alien Sarin Dodole | Gamerot | Alien Clean | Satan Beetle | Pressure | Oni-on | Planet Apple Chicken | Alien Paradai | King Paradai | Uriy | Uringa | Alien Magma II | Rolan | Alien Virmin | White Flower Spirit | Princess Kaguya | Kiraa | Alien Akumania | Ashuran | Sevengar | Taishoh | Alien Atlanta | Alien Mazaras | Specter | Alien Babarue | Black Directive | Silver Bloome | Black Dome | Absorba | Deemos | Black Garon | Blizzard | Mayuko | Hungler | Black Terrina | Satan Mora | Nova | Alien Bunyo | Black End

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