Takayuki Mima is a 27-year-old office worker standing 182 cm tall and weighing 62 kg, born on October 6. He embodies the "unaware and painless type," remaining unfazed and free of distress even when committing clumsy mistakes. Despite occasional blunders, he maintains a serious and uncompromising approach to work duties. His unintentional clumsiness often fosters a relaxed workplace atmosphere, leading colleagues to see him as a hidden healer. Due to a demanding schedule, he actively pursues personal sources of healing to alleviate stress.

He holds a specific fondness for cute, small animals and wears glasses only on mornings he oversleeps. Horror-themed situations unsettle him, causing visible discomfort. His social circle includes Hayate Ichikura, whom he met outside an animal cafe. Takayuki regards Hayate as a stress-relieving "ray of sunshine" and addresses him as "Hayate-kun." He also shares a close friendship with Motoharu Igarashi, whom he initially met during elementary school in Hamaya, Kanagawa. Though Takayuki failed to recognize Motoharu when reconnecting as adults, they resolved the misunderstanding and sustained their bond, with Takayuki using the name "Motoharu." His given name "Takayuki" combines "valuable" (貴) and "this" (之), while his surname "Mima" translates to "three rooms" (三間).