Yuu Inagawa is a 19-year-old female from Kobe who speaks in a Kansai dialect. Her birthday falls on December 7. She stands 155 cm tall with a slim build, small breasts, and body measurements of 79-55-80 cm. Her blood type is B. Yuu has long brown hair, often styled with spiky bangs and twin tails, and features an ahoge. She wears large circular glasses and has garnet-colored tareme eyes, along with a distinctive fang.

Her family owns a Japanese inn and hot-springs resort in Kobe, which she is expected to inherit. This connection to the hot-springs business and her glasses, which resemble the dark patches around a panda’s eyes, have earned her the nickname "Hot Springs Panda" or "Panda Onseniko."

Yuu is a passionate and enthusiastic doujinshi artist who creates parody works, though she prefers to call them homages. She operates as the sole member of her doujin circle "Karamitei." She regularly travels from Kobe to Tokyo to take part in Comic Party conventions, where she is a recognized presence. Yuu enjoys teaching others about doujinshi publishing and comic exhibitions, offering guidance on logistics and customer engagement. Her philosophy prioritizes customer satisfaction over sales figures, a stance that sometimes brings her into conflict with those focused on commercial success.

Her personality is outgoing, hot-blooded, and kind. She speaks rapidly and with high energy, but can become overexcited or angered by negative comments about conventions or inappropriate behavior, occasionally hitting others on the head with a large fan. Despite her dedication to doujinshi, she often neglects schoolwork and exams in favor of drawing, believing she will only continue her artistic pursuits as long as they remain fun and appreciated.

After moving to Tokyo, she becomes a new classmate of Kazuki and remains actively involved in doujinshi activities. Her interactions are marked by a competitive yet caring demeanor, and she demonstrates skill in self-promotion and respectful customer engagement.