Hina Kawai, alias Hairpin Pink, is a spirited high school student and one of five heroines defending a racing circuit from mysterious creatures drawn to its hidden energy source. With a vibrant passion for fashion and helping others, she radiates cheerfulness and optimism, often seen smiling and lending support. Her signature pink hairpin enables a transformation granting superhuman speed, agility, and the power to unleash energy blasts.

Facing trials that challenge her resolve, Hina evolves from grappling with fear and doubt into a resilient protector, steadfast in safeguarding her city and teammates. Guided by empathy and strong morals, she prioritizes authenticity and individuality in her decisions. Yet her sensitivity to criticism and occasional indecision in strategizing reveal her vulnerabilities.

Classified as an INFP personality, Hina’s idealism and imagination fuel her compassionate mediation among peers. As an Enneagram 9w8, she strives for harmony and prioritizes others' needs, though her conflict avoidance sometimes hinders assertiveness and self-advocacy.