Lightnisaur (ライトニサウルス, Raitonisaurusu), is the true main antagonist of Fullmetal Alchemist: Unlimited. 

Vital statistics
Aliases Overgrown Dinosaur
Birthplace Unknown
Date of Birth Unknown
Age Unknown
Family Unknown
Affiliations Unknown
Alignment Unknown
Species Demon
Occupation Unknown
Rank Unknown
Abilities Unknown
Power Level Unknown
Weapons Unknown
Unique Trait Unknown
Goal Unknown
First Appearance Unknown
Voice Actor Frank Welker (FUNimation Dub & Saban Dub)
Seiyū Hajime Koseki


Lightnisaur was created out of all the anger and hate in existence. Soon after, Lightnisaur took over existence and litteraly covers his body ontop of it. 
Lightnisaur True Form

Lightnisaur's True Form.