Suma

Suma is a supporting character of Demon Slayer: Kimetsu no Yaiba. She is a kunoichi and one of Tengen Uzui's wives.

Appearance
Suma is a young woman of short height and with shoulder-length black hair, short bangs, and blue eyes. Similar to the other wives of Tengen Uzui, she sports a shapely figure.

Suma wears a short, blue, sleeveless dress with a plunging neckline that exposes her cleavage, which is secured with a gray obi where she probably stores her kunai. She wears gray ankle-length tabi socks and white zōri with blue straps.

Personality
Suma's personality is particularly similar to Zenitsu Agatsuma's, expressing overdramatic and exaggerated emotions in practically every situation she's in. She also tends to give off a fearful and unconfident attitude when it comes to dangerous situations, as well as a tendency to cry easily, whether due to receiving praise or from fear when being near a demon. She tends to acts immature, arguing with her two co-wives (Makio in particular) and generally irritating them whenever she gets fussy or emotional.

Despite this, she remains a loyal and loving wife to Tengen and cared for the people around her, leading the evacuation of Yoshiwara alongside Makio when the battle between the Upper Rank demons and Demon Slayers became more intense. Her love for Tengen is also prominently displayed when she forgoes her shy and unconfident demeanour and angrily scolded Nezuko Kamado for "cremating" her husband early, later wailing in relief when the poison inside him was burned away.

History
At some point of her life, Suma married Tengen Uzui, along with Makio and Hinatsuru, although she volunteered to be his wife while the other two were arranged marriages. After she left the clan, her family journeyed to see Kagaya Ubuyashiki in order to fight as a part of the Demon Slayer Corps. At some point in the past, Suma was instructed alongside Makio and Hinatsuru by Tengen on his personal ideology: to put their own lives first, then respectable humans, and lastly himself. Later, when Makio questioned this in private as it went against what they had been taught as kunoichi, Hinatsuru assured her that as long as she was okay with it, Tengen would also approve of it. She also wished for the four of them to retreat from the front lines as soon as they defeated an Upper Rank.

Entertainment District Arc
When investigating the Yoshiwara Entertainment District, Suma was assigned as an oiran to the Tokito House. However during the investigation, she disappeared and lost contact with Tengen Uzui. When Tanjiro arrives at the Tokito house in disguise, he overhears the rumor that Suma had run off with a wealthy suitor according to her diary, but is immediately doubtful sensing that something more sinister is occurring.

Later on, Inosuke Hashibira begins to search for the demon and stumbles upon a cavern with a hanging obi holding multiple people captive. As he begins his assault, he manages to free multiple captives including Suma and Makio. The two women proceed to defend the freed captives from being reabsorbed while Inosuke fights the obi. Then a large thundering sound is heard coming from above the cave, and Tengen bursts through the ceiling, rapidly slashing large portions of the obi. He lets the two women know that he's proud of them causing them both to emotionally tear up.

Despite wanting to keep his wives safe, Suma and Makio persuaded Tengen to pursue the demon instead. The two then led a mass evacuation of Yoshiwara to prevent further casualties when the battle between Tengen and the Demon Slayers and the siblings Daki and Gyutaro began to grow more destructive. Eventually, the demons are simultaneously decapitated by the group's efforts. A joyous Suma calls to Hinatsuru and, mistakenly believing she has passed, asks that she come back alive momentarily to see the successful defeat, only to be scolded by Makio for her thinking. Despite the demons' deaths, Tengen remains poisoned by Gyutaro's blood, despite giving him an antidote, his life begins to ebb away. Suma cries loudly at her husband's death, drowning his attempts to say his last words and annoying Makio and Hinatsuru. The former, fed up by Suma's antics, punishes her by stuffing rocks in her mouth. Nezuko Kamado then appears and suddenly sets Tengen ablaze with her Blood Demon Art, causing a horrified Suma to reprimand her for cremating him too early. Tengen, now healed and no longer poisoned, calms her and realizes he is fine, causing his wives to jump on him and cry in relief. Thankful, Suma thanks Nezuko and Tanjiro for saving him. Moments later, the Serpent Hashira, Obanai Iguro, appears to congratulate Tengen on killing Upper Rank Six, though he makes it clear it was still the least of the Upper Ranks. Suma attempts to scold Obanai for insulting him but is scared away by his snake and hugs Tengen in fright.

Swordsmith Village Arc
When Kakushi arrive to Yoshiwara following the battle, Suma is seen assisting Tengen as he makes his way out of the district.

Infinity Castle Arc
In the midst of the battle between the Demon Slayers and Muzan Kibutsuji, Suma alerts Tengen and Shinjuro Rengoku that Nezuko has fled from the Demon Slayer Headquarters and broken down a door to escape.

Abilities
Overall Abilities: Suma does not possess any form of superhuman abilities. However, as she was raised as a kunoichi, Suma possesses respectable shinobi skills, being capable of wielding a kunai as well as performing maneuvers and fighting much more proficiently than regular people can.

Equipment
Standard Kunai: As a kunoichi, Suma carries around dozens of standard black kunai for combat purposes, 2 of which she uses for melee combat and the rest as ranged projectiles.

Trivia

 * Suma's name is composed of the kanji for "ought, by all means" (須) and "grind, polish" (磨).
 * Suma is bisexual.
 * Tengen's prospective wife was actually Suma's younger sister, but Suma wanted to go herself, so she crashed through the door during the marriage interview.

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