Hirari acts as the young protagonist's primary caretaker, handling babysitting duties that encompass supervision and guidance. He is a flying squirrel, gliding rather than achieving true flight. His personality remains consistently calm, collected, and kind toward the forest community.

An accidental marriage occurs between Hirari and the protagonist in the manga's later volumes, orchestrated by flying squirrels mistaking them for a bride and groom. Hirari exhibits a distinct fear of spiders and experiences allergic reactions to Yum Yum Mushrooms. A significant storyline in the final volume explores a body-switching scenario between Hirari and the protagonist, revealing their differing perspectives.

His background includes early caregiving challenges during the protagonist's infancy, stemming from size differences and the child's attempts to imitate his gliding. Throughout the series, Hirari maintains a supportive presence, assisting younger characters in various situations.