Marcel hails from a forest planet, raised in a large farming family of commoners including grandparents, parents, an uncle, an aunt, three older sisters, and an older brother, with his father overseeing a sizable farm. At age thirteen, he received his Messenger Came, ascending to Guardian of Green by fourteen; his Sacrea channels fertility and the thriving of flora and fauna.

He possesses honey-blond hair and distinctive violet eyes. Initially standing 164 cm (5'5") tall and weighing 46 kg (101 lb), he later grows to 170 cm (5'7") and 52 kg (114 lb) in appearances like *Trois*. Born February 27 under the Pisces sign, he has blood type B.

Gentle and nurturing by nature, Marcel adores all living things. His passions include tending plants, bonding with animals—especially small birds—and climbing trees. He keeps a pet blue bird named Chupi and savors browsing books of paintings. His favored scents and foods encompass vanilla extract, sweet cocoa, pudding, fruit pies (particularly cherry), and cream puffs, while he avoids poultry, bell peppers, and dishes labeled with "children." A cherished toy bird remains among his prized possessions.

Among fellow Guardians, Randy and Luva stand as his closest companions, with no known adversaries. He gravitates toward gentle individuals as ideal partners. Throughout official media, his core kindness and bond with nature endure unchanged, with later installments like *Trois* reflecting his physical maturation through adolescence while preserving his innate affinity for life and the natural world.