⌘ - ☁︎︎ | | Muichiro & Yuichiro

Muichiro is a young boy of fair skin and short stature with a lean muscular build along with long, straight hair of a black color that fades to pale turquoise 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 pale turquoise eyes. He is identical in appearance to his older twin brother Yuichiro. Following his meeting with Tanjiro Kamado and the return of his childhood memories, Muichiro's once empty looking eyes seem to now have a hopeful glimmer that is accompanied with a more upbeat and cheery expression, reminiscent of his former demeanor before the death of Yuichiro. Muichiro wears a dark, slightly turquoise-tinted version of the Demon Slayer uniform. His uniform has longer, looser sleeves that are more reminiscent of those of a kimono than of the standard cuffed uniform. Along with this, the lack of bands of cloth wrapped around his calves gives his uniform an overall loose and sizable appearance. He also has dark blue tabi socks and a pair of white zōri with dark blue straps. When Muichiro was young, he wore a light, sleeveless yukata with a light blue mist design, similar to the darker one his brother wore when they were both ten. Due to Tanjiro's presence around him, Muichiro manifested his Demon Slayer Mark during the battle against the Upper Rank 5 Gyokko. Muichiro's mark is dark red coloured, resembling mist shaped clouds on both his cheeks and forehead. Muichiro is an air-headed individual who seems to constantly wander off in thought and is unable to focus on anything. Impassive and, at times, obtuse, he tends to think only for himself and operates on logic alone, never letting emotions guide him, making him seem seemingly 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 devoted to his position as the Demon Slayer Corps' Mist Hashira. Alternatively he seems to display a cold and arrogant side; as shown by him violently shaking down Kotetsu and calling him stupid, saying his time as a Hashira was important, more so than his own, and that all that the swordsmiths could do was make weapons. Despite this, Muichiro doesn't seem to be indifferent towards Kagaya Ubuyashiki, most likely due to his immense respect for his master. However, before the death of his twin brother when the siblings were eleven, Muichiro's personality was that of a much more compassionate and optimistic individual, the polar opposite of his current disposition. Having originally taken after his father, he was shown to display a higher level of kindness and understanding, believing he should aim to do good for others if he wanted good to be done for him. When told by Amane Ubuyashiki that they were descendants to Demon Slayers of old, Muichiro became excited at the prospect of being able to protect people. After his brother was attacked by a demon and witnessing his final moments and death, Muichiro subsequently lost his memories and has held an omnipresent rage deeply suppressed inside of him that inevitably drove his future, intense training. After this memory loss, he started exhibiting the indifferent attitude of his twin brother he is now known for as a Hashira. Following his battle with Gyokko and reuniting with Tanjiro after the latter's battle with Hantengu, he warmly thanked Tanjiro for helping him regain his identity and showed concern for his wellbeing. During his later interactions with Tanjiro, Muichiro started regaining his memories of his past, causing him to behave more maturely and seriously, even choosing to help Kotetsu when his life was in danger instead of ignoring him. After his memory was fully restored, Muichiro began expressing more emotions and became more confident in himself and started caring more for his peers in the Demon Slayer Corps. He also started exhibiting emotions common for someone his age, particularly childishness and immaturity when interacting with his other Demon Slayers. He also appears to be evidently biased towards Tanjiro after his battle with Gyokko in the Swordsmith Village, as his cheerful demeanor when around him was replaced by a cold indifference when around other Demon Slayers. However, he was shown to be more aware of himself and those around him, evident when he realized that Obanai Iguro had a crush on Mitsuri Kanroji, which surprised Gyomei Himejima. His kindness also aided him in building friendships among the Demon Slayers and making happy memories like the ones back when he lived with his family. Despite his young age in comparison to his Hashira brethren, Muichiro is an incredibly talented and skilled member of the Demon Slayer Corps, who was noted by the Flame Hashira Kyojuro Rengoku to be more skilled than he was at his age. Even before becoming a Demon Slayer, he was able to completely overpower a demon using only wooden stakes and farming tools. He has the astounding feat of becoming a Hashira a mere two months after picking up a sword, a feat that would normally take five years of training for the average person and at best two years, which earned him the praise of the Sound Hashira Tengen Uzui. After gaining his Demon Slayer Mark, he was able to engage Gyokko, the fifth highest ranking demon of the Twelve Kizuki, in combat with little difficulty, eventually killing him even after he had transformed into his true form. His fighting prowess was also commended by Kokushibo, the most powerful member of the Twelve Kizuki, and played a major role in the Upper Rank's defeat in spite of his lethal injuries.

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, pale turquoise eyes, a trait, like his hair, that he shared with his twin brother Muichiro. He wore a dark, sleeveless yukata with a light blue mist design, similar to the lighter one his brother wore when they were both ten. 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 stemmed 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, showing 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. Yuichiro and his younger twin brother, Muichiro, were born to a woodcutter and his wife. When they were ten, their mother caught a cold which developed into bronchitis and killed her. Their father, away at the time, went to fetch medicinal herbs during a storm and ended up falling off a cliff to his death. The two siblings survived together, though while Muichiro took after the emotive and kind nature of their father, Yuichiro instead held a cold and impassive outlook on life. In the following spring, Kagaya Ubuyashiki's wife, Amane Ubuyashiki, arrived to recruit them for the Demon Slayer Corps, informing them that they were descendants of powerful Demon Slayers. Muichiro's excitement was opposed by Yuichiro's unwelcoming and rejecting reception, eventually forcing Amane to leave them. Annoyed by Muichiro's continual optimism, Yuichiro lashed out at him in an emotional outburst and revealed that he blamed the death of their parents on their hardworking and selfless nature and instead adopted a cold outlook on life to keep himself and his brother alive. Though Amane continued to visit the twins, Yuichiro chased her away each time, eventually leaving for good when he threw water on her. In the following summer, a demon arrived at their cabin during the night and attacked them; Yuichiro lost his left arm while trying to protect Muichiro by standing between him and the monster. As the demon insulted them for their worthlessness, Muichiro lost himself in a rage and defeated the demon with all the tools at his disposal and wooden logs. By sunrise, the demon withered into ash and Muichiro dragged himself back to the house. There, he found Yuichiro near death praying to the heavens that his brother might survive. Yuichiro then told Muichiro that the 'Mu' in his name means infinity, and told him to live on.