Bibi Harukaze, nicknamed Poppu or Pop, is the younger sister of Doremi Harukaze. Their bond, rooted in sibling rivalry, arises from Pop’s perceived maturity and reliability contrasting with Doremi’s clumsiness, fueling mutual jealousy. Early interactions feature Pop asserting superiority over her sister, while Doremi strives to validate her role as the elder through endeavors like enduring Witch Apprentice trials.

Pop eventually becomes a witch apprentice, sharing magical duties with the group. She contributes to raising Hana, the magical baby entrusted to the group, and confronts challenges ranging from patissier exams to defending the Witch World. Her dynamic with Doremi gradually transforms from rivalry into collaborative support, though her forthright nature keeps Doremi’s shortcomings in sharp focus.

Later portrayals, such as in light novels, depict Pop embracing a sharper bluntness, openly critiquing Doremi’s past missteps. This evolution highlights her growth into a perceptive, assertive figure while retaining steadfast loyalty to her sister and allies.

Pop’s presence spans all series arcs, films, and spin-offs. The 2020 anniversary film features her in a cameo alongside the core cast, affirming her enduring role in the group’s legacy. Her trajectory—from a resentful sibling to a dedicated witch apprentice—showcases themes of self-development and the nuanced layers of family bonds.