Gen Otori ( Ōhtori Gen ) is the Human form of Ultraman Leo, who took this form immediately after his first battle on Earth with Alien Magma and the Gilas Brothers, he was the prince of the now destroyed world of a second planet of Ultra's (after the Land of Light) ruled by his parents.
The only other known survivors where his brother Astra and his pet Ron. The protagonist and the seventh MAC team member. After his home world in Nebula L-77 was destroyed by Alien Magma, he moved to Planet Earth, following the invaders. After the battle with Alien Magma and Gillas Brothers, he was invited to the team MAC. He made his living as a coach in the Town South Club and his girlfriend was the member of the Town South Club (but was killed by Saucer Monster No.1 - Silver Bloome).
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After the MAC Station and Town South Club were destroyed, he lived in his friend's Mei san's house. Unemployed he spent his free time training local youths to defend themselves, a trait that saved him in his last battle as the children took on Commander Blak themselves. After defeating Black End, the last of the saucer monster from the Black Star and the death of Commander Black, he decided to travel, taking of to unknown places.
Ultraman Leo returns in Ultraman Mebius episode 34 A Man Without a Home to help Ultraman Mebius fight Alien Reflect, an alien that defeated Mebius and stated that he would return later to kill Mebius. Gen is displeased with Mebius's performance in the fight with Alien Reflect and refuses to accept him as the defender of Earth, and calls Mebius, who doesn't really know who called him, and they arrive on the island that was destroyed by the Gillas. They see an old man visiting the memorial of those who died, and tells Mirai that this is a place he will never forget, because in his first battle many people were sacrificed here.
Leo appeared in this film as Ultraman Zero’s trainer during Zero's exile. Leo and Zero would battle continuously on a barren planet with Zero wearing Techtor gear armor which made him incredibly slow, much to Zero’s annoyance but Leo insisted that it was necessary for Zero’s training. Then when Seven’s eye slugger was sent as an S.O.S. Ultraman King sent Zero to the battle, followed shortly by Leo and Astra. When they arrived Zero had already defeated Belial and blasted him into a river of molten magma, but no sooner had they arrived, the spirits of 100 monsters started to flow towards Belial and formed the gestalt megamonster Beryudora. Leo and Astra then did their combo attack, while every one else attacked Beryudora on their own until Zero finished him off. Leo then returned to the Land of Light with the others.
Ultraman Leo reappeared in this movie. Ultraman Leo appeared to save M78 from Darclops Zero and also appeared in the beginning of this movie
Leo would then travel in between dimensions to rescue Zero, who was sent their by Darklops Zero along with the Imitation Ultra Brothers. After destroying the Imitations Leo helped Zero get to the dimension with Darklops Zero to continue their fight. After Darklops Zero and the dimension was destroyed, Leo was seen flying away with Zero.
