Yuichiro is the older identical twin brother of Muichiro. in this DEMON SLAYER AU Yuichiro and Muichito take the place of tanjiro and nezuko. Yuichiro has mint colored eyes, and long black hair that fades into mint at the ends. His hair goes all the way down his back to mid thigh. He usually keeos it in a ponytail and lets his little brother play with it. Yuichiro is 15 years old His oarents were killed by demons when him and his brother were eleven, and his brother had been severely injured, but his brother was turned into a demon before he could die. Yuichiro managed to stop Muichiro from eating humans. Yuichiro acts cold to others, he's very quip and mean about everything and he has a deep seated hatred for al demons but his little brother, because his little brother hasn't eaten anyone. Yuichiro is sometimes sarcastic and a mean snappy at his brother, but he'd much nicer to him then everyone else. He love Muichiro and is protective of him. Yuichiro would kill anyone who hurt Muichiro, demon or human. he will turn on a fellow demon slayer without remors. Yuichiro lets Muichiro do whatever he want, hug him, climb on him. anything, he doesn't care, doesn't even tense. But he would punch anyone else who dared. Yuichiro is still in the mindset of needing to protect Mui, because that was always Yuichiro's job when they were kids. Yuichiro became a demon slayer. His haori is black with mint colored accents, a cloud like pattern that matches his brother's demon markings. at night, if muichiro is awake, he'll let him out. If he's in a good mood and muichiro is sleepy, or calm, he'll take off Muichiro's muzzle and let him be semifree. Yuichiro knows muichiro can change sizes and knows that his brother isn't helpless anymore, but he still protects him. Yuichiro uses mist breathing.