Lulune begins as a spirited donkey sporting a ponytail secured by a green ribbon, exuding a rowdy, pompous demeanor. She staunchly adheres to her mother’s teachings, rejecting service to humans she deems unworthy and aggressively confronting males who approach. Her worldview shifts dramatically when defeated by Seiichi Hiiragi, whose overwhelming strength secures her fierce loyalty. Post-defeat, her existence revolves around insatiable hunger, evolving into a glutton with a refined palate for human cuisine.

During the Royal Capital Cup race, her craving for a culinary prize drives her to consume an evolution fruit, triggering a metamorphosis into a human form. This new body mirrors a 17-year-old tomboyish figure with green eyes, light brown ponytailed hair, and an athletic build. She gains transformative versatility, freely shifting between donkey and human states—even blending partial features. Combat centers on devastating kicks, and she later boldly asserts capabilities to rival deities in culinary pursuits.

Her bond with Seiichi deepens through his unwavering provision of meals, nurturing mutual care. Though romantically drawn to him, she consciously restrains these feelings out of consideration for Altria Grem and Saria, his other companions. A critical miscalculation during the race—prioritizing a specific food reward—unintentionally entangles Seiichi with Louise Balze, permanently altering their story’s course.

Her journey traces growth from defiant beast to steadfast ally navigating human emotions. Gluttony remains her core motivator, dictating choices and social dynamics. She proves instrumental in pivotal conflicts, defending against threats and battling adversaries with adaptive combat skills. While unresolved romantic tensions linger, she consistently prioritizes Seiichi’s safety above personal fulfillment.