Honoka Yukishiro is a highly intelligent and academically gifted middle school student who transfers from Verone Academy for Girls to public school with Nagisa Misumi. Her calm, reserved, and analytical personality stems partly from a childhood illness that limited her social interactions. She possesses extensive scientific knowledge in biology and chemistry, frequently applying it practically. Living with her grandmother due to her parents' overseas scientific work, she is chosen by the fairy Mepple to become Cure White.

This transformation grants enhanced strength, speed, agility, and access to attacks like "Marble Screw" and "White Hurricane." As the "Light of Wisdom" complementing Cure Black's "Light of Heart," her purification and healing abilities culminate in joint techniques like "Pretty Cure Rainbow Therapy" with Cure Black. Her inseparable partnership with Cure Black (Nagisa Misumi) relies on deep friendship and trust, enabling their initial transformation and ultimate attacks such as "Pretty Cure Rainbow Storm."

Initially hesitant about combat, Honoka embraces her role as a guardian protecting the Garden of Light and Earth from the Dark Zone. She learns to open up emotionally, forming bonds with Nagisa, the fairies Mepple and Mipple, and later allies. While retaining her thoughtful nature, she gains confidence and expresses her feelings more openly, demonstrating exceptional strategic thinking during battles.

In the movie *Eiga Precure All Stars New Stage 3: Eien no Tomodachi*, Cure White appears alongside other Pretty Cure warriors from multiple generations, participating in group battles against Eternal to emphasize enduring friendship. The movie introduces no new background, character development, or unique individual actions for Cure White beyond this collective participation.