Obanai is a fairly muscular man of short stature and a pale complexion. 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. Obanai is a very harsh and strict individual who shows no concern for those who do not abide by the Demon Slayer rules. His expectations for his fellow Demon Slayers are quite unrealistic.