Marcel, the Guardian of Greenery in the Shinchou Universe, embodies the Sacrea of fertility and the thriving of plants and animals. He originates from a forest planet where his family maintains a large farm, with a lineage including grandparents, parents, an uncle, aunt, three older sisters, and an older brother. At 14 years old, he stands 164 cm tall with honey-blond hair and violet eyes. His cheerful personality combines sensitivity to Sacrea and a deep connection to living things, reflected in hobbies like cultivating plants, interacting with animals, and climbing trees. He keeps a blue bird companion named Chupi and avoids poultry and bell peppers, favoring sweet cocoa, pudding, and fruit pies such as cherry pie.

Marcel attained his Guardianship at age 14 after receiving his messenger bird at 13. His role involves channeling his Sacrea to foster life and preserve ecological harmony. Within the narrative, he actively aids Ange, the Legendary Etoile, by contributing his Sacrea to her mission of revitalizing the Seijuu universe. He displays profound concern for Ange, appearing devastated during her coma and weeping openly at her recovery. Later encounters reveal blushes in her presence, suggesting emerging romantic feelings. Among fellow Guardians, he shares his strongest bonds with Randy and Luva.