Rumillion "Rumy" Shine is an elf magician separated from her family and friends when a raging inferno destroyed her village. Pastel and her companions discovered Rumy alone and weeping by the roadside while traveling to Evelyn, taking her into their party. Her search led to finding her mother.

Rumy accidentally became an adventurer when Clay submitted an application on her behalf, mistakenly believing she intended to join Pastel's group. Unlike Pastel, who failed both exams, Rumy passed the written and practical tests on her first attempt; her written success resulted from correctly guessing a multiple-choice answer, pushing her score past the requirement.

Innocent and childlike in speech, Rumy affectionately calls Pastel "Paaru," viewing her as an older sister. She possesses fluffy silver-blonde hair framing large blue eyes, creating an angelic look. Her gluttony is frequent, punctuated by her catchphrase: "I'm starving."

Rumy travels with Pastel's adventuring party: Clay the Warrior, Trap the Thief, Kitton the Learner, Nor the Giant, and Shiro-chan the White Dragon. Her primary motivation remains reconnecting with her lost family, a goal partially fulfilled upon locating her mother.