Mint partners with Lemon Yamagishi as her Sweets Spirit. At 150 years old, she ranks among the youngest of her kind. Her distinctly childish personality emerges through third-person self-references and speech endings like "-deshi" instead of standard "-desu," complementing her consistently positive, happy, and even-tempered nature.

Despite her youth, Mint demonstrated exceptional ability by passing the Sweets Spirit advancement examination on her first attempt. She exhibits humility through her unbothered acceptance of being unable to read. Preferring to stay in the background, she contrasts with more attention-seeking spirits. Her parents express affection with hugs upon returning from trips, reflecting a supportive family environment.

Mint formed her partnership with Lemon at St. Marie Academy's Japanese Branch Campus. This bond followed Lemon’s personal growth after a rematch loss to Ichigo Amano in the Cake Grand Prix’s second round, where Lemon overcame her previous intense fixation on winning. Their partnership underscores a core Sweets Spirit principle: bonding only with humans whose pâtissier aspirations stem from genuine passion, not external pressure.

Within Team Lemon and later Team Ricardo, Mint maintains harmonious collaboration with her partner. Her youthful perspective and balanced temperament actively contribute to the team’s dynamic during their professional endeavors in St. Marie Garden.