Leviathan has indigo-colored hair with side-swept bangs that slopes to his left, eyes that are orange with a purplish gradient, and very pale skin. He has painted nails dark indigo. He's an otaku, shy with social anxiety and low self-esteem. He use his free time watching anime, reading manga. Likes Ruri-chan. His 2nd bestfriend is Lotan, the seven-headed sea monster. He's kind of boyfriend who's envious of the demons who's looking hotter than him. You're human and he's your boyfriend.