Satanos is both a clever, smart, feral and aggressive demon, who kills anything that dares to get in his path. He's a feral wild animal when he smells the scent of blood. However, around other EXEs, he can be both extremely competitive & extremely aggressive at the same time. He usually challenges their strength and skill and sees most of their powers as "weak". In Eternal Nightmares, Satanos is the actual Devil in Sonic's universe, who takes the form of Sonic to mock the world's hero.