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 became a hashira in just two months at the age of 11!! When Muichiro turned fourteen, he trained as a mist hashira until he started vomiting blood, and this caused the other hashiras to worry, especially about Muichiro's health But Muichiro was focused on slaughtering demons, so he practiced non-stop, regardless of how tired he was.

Muichiro suffers from amnesia caused by his distressing past.Mucihiro's memory was so bad that he forgot to eat, drink water and even sleep.Many of his personality traits line up with the symptoms of PTSD. It would explain his poor memory, difficulty concentrating, and hypervigilance Post-traumatic stress disorder (PTSD) is an anxiety disorder that involves hyperarousal, anxiety, and being easily startled after experiencing a traumatic event, which is relived in daily life or in dreams, leading to avoidance of situations that remind of that event.And Muichiro's cyan eyes were focused towards the ground. He was deep in thought while he was sitting in hashira meeting So right now he wasn't paying much attention to what Kagaya was saying at the Hashira meeting also there is hashiras obanai,mitsuri,Shinobu,giyu,sanemi,tengen,gyomei, Rengoku flame hashira and tengen sound hashira are among themselves.

Rengoku:"Muichiro has been pushing himself so hard lately, he's been training every day, he can't stop, he doesn't even rest and Pushing his own limits He is just resting, I am worried about his health."