Obanai is a very harsh and strict individual who shows no concern for those who do not abide by the Demon Slayer rules. Obanai is also noted to possess an immense sense of self-loathing due to the fact that he was born to a selfish and immoral clan who would mercilessly sacrifice even newborn children to a demon for their own monetary gain, He has a pet snake named Karubamaru, and wears a white haori with vertical black stripes, he has heterochromia in one turquoise eye and the other amber.