Suma, a kunoichi and one of three wives to Tengen Uzui, the Demon Slayer Corps’ Sound Hashira, originates from a ninja clan bound in service to the Uzui family. She disrupted her younger sister’s arranged marriage to Tengen, offering herself as his bride instead, motivated by her own concealed affections. This choice severed her ties to her clan, leading her to join the Demon Slayer Corps, where she honed stealth tactics and combat skills with kunai knives. Her personality oscillates between theatrical outbursts of anxiety and flashes of daring resolve. On missions alongside Tengen and her co-wives, Makio and Hinatsuru, she navigates a dynamic of bickering camaraderie and steadfast allegiance. Disguised as an oiran in Yoshiwara during the Entertainment District arc, she investigates demonic threats but is apprehended by Daki, Upper Rank Six, who exploits her blood to craft sentient sashes that ensnare victims. Imprisoned beneath a brothel, she is later freed by Tengen and allies, then aids civilian evacuations during the clash against Daki and Gyutaro. In the Infinity Castle arc, she briefly resurfaces to inform Tengen and Shinjuro Rengoku of Nezuko’s pivotal actions. While her post-war fate remains undetailed, implications suggest she endures, resuming life with Tengen and her co-wives. Her narrative threads together her ninja heritage, unwavering dedication to her husband, and assimilation into the Demon Slayer Corps, framing her as a figure of tenacity who confronts peril despite her tremulous disposition.