Detonator Orgun

Detonator Orgun (デトネイター・オーガン, Detoneitā Ōgan) is a 1991 Japanese original video animation series by AIC and Artmic, directed by Masami Ōbari with character designs by Kia Asamiya (working under his real name, Michitaka Kikuchi). The series was released on DVD in 2001 by Central Park Media in the United States, in 2002 by Happinet Pictures in Japan, and in 2003 by Manga Entertainment in the United Kingdom. Orgun later appeared in the Super Robot Wars W video game.

Plot
Fleeing from his own race, Orgun—an alien being with superhuman abilities and unearthly weapons—travels to Earth to find an answer to his origin. There, he bonds with a young man named Tomoru to defend Earth against the Evoluders, who seek nothing but destruction of other civilizations.