Tamotsu Araki is a first-year student at Tensho Academy. He possesses light brown hair styled with bangs and longer sections framing his face, complemented by dark brown-red eyes. His standard uniform includes a buttoned navy academy jacket, a white undershirt, a red tie typically designated for second-year students, dark brown checkered pants, and brown leather shoes.

Motivated by a desire to cultivate a more masculine image, Tamotsu actively participates in the Kendo Club. This drive is rooted in childhood experiences where his mother and sister frequently referred to him as "cute" and treated him like a girl – something he strongly dislikes. Despite this specific sensitivity, he generally maintains an upbeat and positive demeanor.

Relationships are significant for Tamotsu. He holds deep admiration bordering on idealization for his senior, Ushio Azabu. This manifests in behaviors like collecting Ushio's pictures and showing them to friends. Tamotsu repeatedly asked to join the Japanese Culture Research Club led by Ushio, who consistently refused, citing a desire to keep him away from other members while acknowledging Tamotsu's earnest nature.

He shares a close friendship with fellow students Masaru Gohonmatsu and Hajime Kiriyama, who affectionately call him "Arakan." They frequently eat lunch together, and assist him with tasks like reaching high places on a whiteboard. Within the Kendo Club, his interactions with Yuto Nijo involve Yuto finding Tamotsu's quest for manliness amusing, though Yuto retracts his comments if Tamotsu becomes upset. Tamotsu is roommates with Sosuke Kagura and has adjusted to Sosuke's habit of staying up late composing music.

His personal preferences include favoring soba as his food of choice and showing a keen interest in training activities. The etymology of his name reflects "Tamotsu" meaning completion, perfection, or endings, and "Araki" suggesting concepts of freshness or newness combined with wood or tree.