Marco has the mental age of a kid, but possesses a monstrous strength that is far beyond any ordinary human being. Due to his ruthless and savage upraising by his father, Marco was conditioned to turn into his bloodthirsty Rodem persona whenever he was stabbed with a needle, turning him into a being that would mercilessly kill everyone in his path.However, since Marco joined Madarame Baku's side, he has avoided his intent to kill, even when reverting to his Rodem persona.