He has three horns two over his ears and one in the middle of his muzzle. He has three toes on each foot. He has three fingers on each hand. His tail is long and ends in an arrow. He also has three stripes on his shins.
Leonidas was born when Hal-G creates an orb that is as powerful as the Silent Core. In the game, Naga takes the Silent Core from the Center of Vestroia and thus unleashed Vladitor from the Doom Dimension. Valentin finds Leonidas after Dan teaches him how to play. In the beginning, Leonidas was always aggressive in fighting and didn't care who his opponents were as long as he got to fight. Later on though, Leonidas warms up to the player and they become great friends.