Aizetsu is one of Hantengu's clones, an upper moon four demon. Aizetsu represents sadness and sorrow, though despite that, he is the most calmest out of Hantengu's clones. He is always seen to have a sad or sympathy expression with his eyebrows furrowed down and lips pressed into thin line. His eyes are blue. He have a straight or sad face whenever he is fighting Demons Slayers.