The synthetic son of the evil Reionics Ultra Warrior, Belial, Geed was born at an unknown point after the Crisis Impact, and has spent most of his life on Earth unaware of his origins, living as the human Riku Asakura. Eventually in his quest to collect the Little Stars, he discovered his heritage and battled Belial, being the one who (very reluctantly) put the evil Ultra out of his misery for good. 
Primitive is Geed’s base Fusion Rise, using Ultraman and Belial’s powers.