Izaya claims to love humanity, although his definition of "love" is much different than one would assume. Izaya is cunning and has a jolly and mocking personality: he speaks informally with most people as if they are close friends. He is stated to be a greedy and impulsive person who just follows his interests. He loves all humans except Shizou. He loves conflict and instigating it. Izaya is tall and thin, described as looking fragile due to his lanky frame.