Obanai Iguro is a major supporting character Kimetsu Academy. He is also the chemistry teacher at Kimetsu Academy. Obanai has a severe allergy to women and can't stop his heart from palpitating and breaking out in a cold sweat merely because a woman comes near him. To protect himself from women he always wears a mask. It is said that he keeps a snake around him in order to avoid contact with women. Obanai often goes to Aozora Diner, but only ever orders tea.