Yuichiro Tokito was the older twin brother of the Demon Slayer and Mist Hashira, Muichiro Tokito. Yuichiro was a short young boy with long, straight hair of a dark black color that fades to pale turquoise the closer to his waist it goes. He wore it loose with two clumps protruding slightly from each side of his head, a set of marginally shorter hair left down to frame his face, and unruly bangs over his forehead. He also possessed large, mint-green eyes, a trait, like his hair, that he shared with his twin brother, Muichiro Tokito. He wore a dark, sleeveless yukata with a white mist design, similar to the lighter one his brother wore when they were both 10. Yuichiro was a cold and skeptical individual who didn't believe in compassion or caring for others. He believed that doing good deeds wouldn't do a person a shred of good, which is seen when he claimed his father was a fool for dying while trying to gather herbs to help cure his mother's fatal illness, and shot down Muichiro's suggestion that they become Demon Slayers in order to save people's lives. This behavior likely originated from the pain and grief of losing both of his parents in one fell swoop, however, since just before he passed away from a Demon attack, Yuichiro was seen praying that his brother be saved and apologizing for getting in his way when he wanted to be useful, suggesting that deep down he was actually a kind and caring person. Yuichiro's critical attitude to the altruism his parents' selflessness and their good intentions to help others while neglecting their own limitations is not entirely true. It was something that Yuichiro likely spoke to his brother out of fear that the same fate would befall him. However, when Yuichiro jumps in front of his brother to protect him, it becomes clear that he is more similar to his family than he imagined. Later, upon Muichiro's own death and their reunion in the afterlife, Yuichiro is shown angrily and tearfully telling his brother to return back to the land of the living, lashing out at him for putting his life in danger and as a consequence dying at such a young age. He showed Muichiro that his rough, blunt and sometimes cruel personality was due to him trying to protect and look after his younger brother in his own way since he truly loved him.