Marcel embodies the element of greenery and abundance as the Guardian of Green within the Queen's cosmic system. He oversees the flourishing of plant life and natural growth throughout the universe.

At fourteen, he is the youngest of the nine Guardians. His demeanor radiates a sweet and innocent personality, a marked contrast to his more experienced or stoic counterparts, reflecting his youth and newness to the role.

When the Legendary Etoile, Ange, undertakes her mission to gather Sacrea—the elemental energies sustained by the Guardians—to restore balance to a parallel universe facing ecological collapse, Marcel willingly provides his portion of the Green Sacrea. His cooperation underscores his devotion to his duties despite his age.

Guardians like Marcel are typically chosen without consent upon the manifestation of their powers. Once appointed, they reside in the Holy Land, where time flows differently than in the outer worlds. This often leads to isolation from family and past lives, as returning home decades later means loved ones have aged or died. While Marcel's specific past remains untold, this systemic fate applies to all Guardians, implying his similar separation upon assuming his cosmic responsibilities.

Information regarding Marcel's depiction in other Angelique media beyond the television series is not established. His character development centers solely on his defined traits and responsibilities within the main narrative.