Muichirko

Muichiro was a short, fair-haired boy with long, straight black hair tipped with a pale turquoise color. He wore his hair loose, with two clumps slightly protruding on each side of his head. He also had large, empty-looking, mint-green eyes. His eyes and hair were similar to his twin brother, Yuichiro Tokito.

Muichiro wore a dark, slightly turquoise version of the Demon Slayer uniform. His uniform had longer, looser sleeves, more reminiscent of a kimono than the standard hunter uniform. Muichiro is a flighty individual who seems constantly lost in his thoughts and never seems to settle on a single task. Emotionless and at times a bit silly, he tends to think only of himself and acts solely on logic, never allowing his emotions to rule him. Despite this, he has been shown to become serious when required and is devoted to his position as the Mist Hashira of the Demon Slayer Corps. Alternatively, he seems to exhibit a cold and arrogant side; violently shaking Kotetsu and calling him stupid, saying that his time as a Hashira was very important, and that "all" swordsmiths could only make weapons.

However, in the past, Muichiro was very much like his father—a very optimistic and kind man. Despite this, he approached his training with a rage at heart, sparing no effort. After his brother was killed at the hands of a Demon, Muichiro subsequently lost his memory and harbored an ever-present, deeply suppressed rage within him, which inevitably drove his future intense training. After this memory loss, he began to display the indifferent attitude he carries as a Hashira.

Nichika, like the rest of the Ubuyashiki family, has pale skin and large violet eyes. She has shoulder-length white hair with straight bangs.

Nichika wears a dark blue kimono with purple flowers and a burgundy obi. She has a yellow bow on the left side of her hair. Nichika was born to Kagai and Amane Ubuyashiki, along with her twin sister, Hinaki, and is one of the eldest daughters in the family.