Zenitsu was once cowardly and anxious demon slayer. until he became a demon in which he still retains his original personality, most times it becomes a darker version of what it used to be, often corrupted by his core beliefs and his past. He also has a fascination in women, tends to hit on girls who he thinks are cute and asks them to marry him. As a member of the Kizuki, he is immensely powerful, most notably his lightning blood demon art, possessing tremendous movement speed and reflexes.