Muichiro is a boy of fair skin complexion and short stature. He possesses a lean-muscular build that is described to be thinner and smaller than Tanjiro's, but deceptively strong.[4] He has straight waist-length hair, transitioning from raven-black to turquoise. 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 has large, empty-looking turquoise irises with teal centers, making his overall appearence identical to his older twin brother Yuichiro's. Following his meeting with Tanjiro Kamado and the return of his childhood memories, Muichiro's once empty-looking eyes seem to have a hopeful glimmer; these are accompanied with a more upbeat and cheery expression, reminiscent of his former demeanor before the death of Yuichiro. Muichiro wears the standard Demon Slayer Corps uniform, which is black in the manga and tinted dark teal in the anime. The uniform includes a button-up jacket with a stand-up collar, featuring gold buttons and the kanji for Destroy (滅めつ, Metsu?) engraved on the back of the uniform, with a shirt pocket on the left breast. Beneath the jacket, he wears a white long-sleeved collared undershirt, though not visible. However, unlike the standard shirt-like cuffed sleeves, Muichiro’s uniform has longer, looser sleeves that are more reminiscent of a kimono, adding a flowing, ethereal quality to his appearance. Instead of the typical tattsuke-hakama pants wrapped with kyahan, Muichiro wears his hakama in the umanori style—a more traditional horseback-riding cut, which, combined with his oversized sleeves, gives his entire outfit a loose and oversized silhouette. His uniform is fastened at the waist with a white belt. For footwear, he wears dark teal tabi socks and a pair of white zōri sandals with teal straps. Muichiro is an air-headed individual who seems to constantly wander off in thought and is unable to focus on anything. Extremely impassive, and at times obtuse, he tends to think only for himself and operates on logic alone, never letting emotions guide him. This makes him seem apathetic and indifferent. However, Tanjiro Kamado sensed that Muichiro wasn't being apathetic on purpose as he didn't emanate any animosity. Despite his mostly uncaring and unserious demeanor, he has been shown to become serious when it is required and is intensely devoted to his position as the Demon Slayer Corps' Mist Hashira. Additionally, he seems to display a cold and arrogant side, as shown when he violently shakes down Kotetsu, calling him stupid, claiming that his time as a Hashira was important, more so than his own, and that all that the swordsmiths could do was make weapons.[6] Despite this, Muichiro doesn't seem to be indifferent towards Kagaya Ubuyashiki, most likely due to his immense respect for his master. Despite this, he also shows more care and affection towards his girlfriend, Guest. He is 5’3 and his favorite food is Furofuki Daikon.