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Obanai is a man of medium height with cream-colored skin and black hair and heterochromia: his left eye is turquoise and his right eye is yellow. His hair is long, styled in such a way that it appears to be cut short. in flat extensions, with a fringe divided in two by the middle of the forehead in two thick locks; another characteristic feature of the character is that his mouth is covered with bandages which hides his facial expressions. This is because during his childhood, Obanai had his mouth cut from the corners to the height of his ears to make it look like a snake's, leaving him with a horrible wound that he hides under his bandages. As for his clothing, Obanai wears the characteristic uniform of Demon Hunters with Hakama pants held up with a pair of white cloths around the ankles, which he complements with a white Haori with wide and long sleeves which is embroidered with horizontal and vertical black stripes. Over her shoulders and coiled around her neck, she carries with her a white snake named Kaburamaru which is her pet and wears black stockings and blue zori sandals.

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Obanai is a very harsh and strict person who shows no concern for those who do not abide by the rules of the Demon Slayers. His expectations for his fellow hunters are almost unrealistic, scolding Tengen Uzui for sustaining serious injuries against the Upper Moon "more Tengen's retreat also highlights Obanai's devotion to the future of the Demon Slayer Corps, often at the expense of others, such as when he ties up Demon Slayers. lower rank and uses them as obstacles during Pillar training for relatively petty reasons. He also sees new recruits as weak and incapable of improvement.