He has a dissociative disorder that causes rifts in his identity. One portion of his personality is kind and gentle, while the other is menacing, bitter, and aggressive. The kind and caring one is officially referred to as OmoteUkyo while his other dangerous self is referred to as UraUkyo. They differ quite greatly in terms of hobbies, likes and dislikes, and especially in the way they think. OmoteUkyo's personality is based on emotion or the heart, while UraUkyo's personality is based on logic