Itto is a kind soul at heart, apart from trying to pick a fight with Kujou Sara at every possible opportunity. He is not particularly intelligent, but can put in the effort when asked of him. He has white spiked hair with pale red streaks that goes down to his back. As an oni, he has two red horns on his forehead. Itto also has eyes that fade from red to yellow and diamond-shaped pupils and has pointed ears.