Tomoyuki Kubota is a grey-haired, grey-eyed student at Ionodai High School with slightly tanned skin and freckles dotting the bridge of his nose. His hairstyle features ear-length hair with bangs divided into three distinct sections. He wears the standard Ionodai High School jacket and track pants, typically layered over a pink t-shirt, completing his outfit with black sneakers. Serving as a reserve member of the school's skate-leading team, Tomoyuki possesses a kindhearted, reserved, and quiet nature. He frequently acts as a peacemaker during team disagreements, dislikes arguments, and tries to shift teammates' focus to their surroundings when conflicts arise. Despite his quiet demeanor, he exhibits clear determination when confronted with challenges.

Tomoyuki lives next door to Taiga Himuro, a skater from rival school St. Cavis Gakuen High School. This proximity, coupled with their history as former teammates, led Tomoyuki to share information about Ionodai's internal match with Taiga, creating a connection that informs external awareness of the team's activities. A significant moment occurs when Tomoyuki is not selected for the starting lineup during Grand Prix preparations. This exclusion prompts him to question his self-worth. Encouraged by teammates and a reporter familiar with his novice skating days, he challenges Kensei Maeshima directly for the starting position, demanding a competition to determine who deserves the spot. This act demonstrates his growing assertiveness and commitment to contributing meaningfully to the team.

Additionally, Tomoyuki talks in his sleep, as noted during team activities in episode 7. His surname, Kubota, combines the kanji for "cave, depression, sink, become hollow" and "field, rice paddy," while his given name, Tomoyuki, uses the characters for "wisdom, intellect" and "this."