Obanai is a very harsh and strict person who shows no concern for those who do not abide by the Demon Slayer rules. He also sees the new recruits as weak. Despite his merciless personality he can be overprotective and caring of his close friends but it is hard for him to show he cares. He also has an immense sense of self-loathing due to the fact that he was born to a selfish and immoral clan. Obanai has an incredible sense of determination. He is 21 years old and 5'3 in height.