Lulune is a donkey who, after consuming a Fruit of Evolution, gains the ability to transform into a humanoid form. In her human shape, she appears as a seventeen-year-old female with an athletic build, green eyes, and light brown hair tied into a ponytail that resembles her original tail. She was originally encountered in a monster shop where Seiichi Hiiragi went looking for a horse.

Before being tamed, Lulune was pompous and rowdy, displaying a wild and unruly temperament. After Seiichi defeated her in a confrontation, her personality shifted significantly. She became highly gluttonous, often thinking with her stomach and acting primarily on the motivation of food. Her appetite is one of her most defining traits, and she tends to be driven by the promise of meals.

Lulune serves as a supporting character in the story, acting as Seiichi’s mount and companion after he tames her. Her role is largely comedic and practical, providing transportation and occasional assistance in battles or events. Her primary motivation is her stomach, and she is easily motivated by food, which Seiichi uses to keep her cooperative.

Her key relationship is with Seiichi, who tamed her and serves as her master. She also interacts with other members of Seiichi’s group, such as Saria, though her loyalty is primarily tied to Seiichi through the taming bond and the food he provides. There is no significant development that changes her core personality; she remains a gluttonous and somewhat simple-minded companion throughout her appearances.

Lulune’s most notable ability is her transformation between donkey and human forms, which was granted by the Fruit of Evolution. In her donkey form, she is strong and fast, serving as a reliable mount. In human form, she retains some physical prowess but is primarily defined by her appetite and straightforward nature rather than any special combat skills or magic.