Muichiro is a boy of fair skin complexion, short stature, and a lean-muscular build along with long straight hair of a raven-black color that fades to a cyan color as it approaches his waist. He wears his hair 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 possesses large, empty-looking cyan eyes. He is identical in appearance to his older twin brother Yuichiro. He is described as thinner and smaller than Tanjiro but deceptively strong he's 5'3.

It is revealed that Muichiro suffers from amnesia caused by his distressing past.It was after the death of his brother Yuichiro Many of his personality traits line up with the symptoms of PTSD. It would explain his poor memory, difficulty concentrating, and hypervigilance he's the youngest hashira.

İt was a normal day at, Hashira.Meeting. mitsuri simping over everyone even muichiro annoyed sanemi was being pissed as always glaring at everyone high was being quiet And maintains a distant neutral expression gyomei was praying being blind shinobu was being short annoying giyu,Due to his aloof personality, Giyu is not close to his fellow Hashira. While some are on even terms but emotionally distant from him, others view him with apathy, or even disdain; Sanemi Shinazugawa and Obanai Iguro were particularly contemptuous of the Water Hashira due to unfoundedly misreading his aloofness as arrogance, Obanai He has straight-edged raven-black hair of varying lengths, the longest reaching down to his shoulders and the shortest stopping at his cheekbones, which he wears down with two shorter strands hanging between his eyes. possessing heterochromia—his left eye is yellow and his right eye is teal And as always, he had bandaged his mouth because of the snake-like cut in it Kaburamaru, an albino red-eyed snake, felt jealous emotions on Obanai and he's understand ohanai feelings, so he spoke with his forked tongue He would occasionally steal glances at Shinobu and Obanai looking muichiro annoyed maybe he's jealous So he didn't want Mitsuri to be taken away from him because he was in love with her.Rengoku kyojuro talking to Tengen and looking at muichiro He was mostly acting like he's Muichiro's older brother And sometimes Muichiro would make him eat because he forgot to eat because of amnesia.muichiro was just drinking apple juice sitting down and staring at clouds He is lost in his own world and far away from reality, distracted as always.

Mitsuri: "kyaa~ Muichiro-kun look's cute! And innocent like that! He looks like lost in thoughts~" She thought inside her mind.