Lumiale serves as the Guardian of Water in *Koi Suru Tenshi Angelique: Kagayaki no Ashita*. Hailing from an ocean planet and a commoner family—his father an artist—he has two older brothers, one younger sister, and parents.

Standing 183 cm tall and weighing 67 kg, he possesses silvery blue hair and deep sea blue eyes. Born under the Taurus sign on May 3 with blood type A, he arrived at the Holy Land as a Messenger at age 16, becoming Guardian by 17. His water-based Sacrea grants him medical treatment, healing, and protective powers.

Delicate and conflict-averse, Lumiale maintains a close friendship with Clavis, Guardian of Darkness, yet frequently clashes with Oscar, Guardian of Fire. He plays the harp, cultivates herbs, and practices watercolor landscape painting. He amasses music boxes and expresses curiosity about the world beyond his own. Lumiale favors the scent of rain, enjoys herb tea, aromatic herb salads, and asparagus pasta, but avoids foie gras, turkey, and whole cooked fish. He values small, aesthetically pleasing tropical fish and owns a cherished violin.

As one of the nine Guardians, Lumiale assists Ange, the Legendary Etoile, in restoring balance to a parallel universe, utilizing his healing and protective Sacrea. The Guardians' duties involve compulsory recruitment and temporal displacement from their original lives and families.