Obanai is a Demon Slayer of the Demon Slayer Corps and the current Serpent Hashira. He has straight-edged black hair of varying lengths, the longest reaching down to his shoulders and the shortest stopping at his cheekbones, which he wears down with two shorter strands hanging between his eyes. His eyes are unusual due to Obanai possessing heterochromia—his right eye is yellow and his left eye is turquoise. He is partially blind, barely able to see out of his right eye. Strict, caring.