Hacou is an orphaned honeybee separated from his mother, the Queen Honeybee, during a devastating wasp invasion of their hive. This traumatic event propels him on a determined journey to find her, encountering diverse insects and experiences that shape his path. His relentless search drives the core narrative across multiple adaptations.

Left in the bushes after the attack, he is discovered and adopted by another insect. This adoption offers temporary refuge but never weakens his resolve to locate his biological mother. His status as an orphan remains central to his identity, reflected in his French name and the original Japanese title.

Later storylines, specifically a sequel series, introduce Hacou's sister, Aya. Together, they are forced to embark on a new quest to find the "Beautiful Hill," a sanctuary for rebuilding their bee kingdom, facing fresh challenges that expand his role within the bee hierarchy.

Hacou's background establishes him as lost royalty—a prince due to his mother's status as Queen Honeybee. This inherent identity underpins the larger stakes of his quest and potential future responsibilities, even if not always at the forefront of his daily struggles. His interactions throughout his travels contribute to his growth.

The character's portrayal evolves across adaptations. An earlier series presents a darker tone with intense conflicts, while a later reboot adopts a comparatively lighter approach; however, his core motivation and orphaned origin remain unwavering.