Marron Glacé appears as the younger brother of Carrot Glacé, though his stature and composed manner often suggest he is the elder. He exhibits a docile and gentlemanly personality, a marked contrast to his brother's impulsiveness. Possessing a notably feminine appearance that attracted childhood bullying, he was consistently shielded by Carrot during that time. This dynamic reversed in their teenage years, with Marron becoming fiercely protective; he reacts aggressively to any threat against Carrot, their friends, or allies.

An expert in Eastern-style magic, which doesn't require innate Sorcerer abilities, he can conjure the Four Symbols. He is also a skilled swordsman but seldom uses his blade in combat. A significant weakness is his complete intolerance for alcohol.

Fellow Sorcerer Hunter Gateau Mocha pursues Marron romantically, driven by his physical beauty and often expressing this through overt advances, which Marron typically ignores. While early material suggested an openly gay orientation, later interpretations present him as more asexual, showing little romantic or sexual interest in others. A recurring element, particularly in the manga, is his unusually strong and overt affection for Carrot, sometimes interpreted as bordering on suspicious.

Within the team, Marron often acts as a stabilizing force, particularly reining in Carrot's erratic behavior. This extends to combat situations involving Carrot's uncontrollable beast transformations. While the anime depicts Tira Misu primarily reverting Carrot to human form, the manga shows Marron actively participating by extracting the magic causing the transformation after Tira weakens the beast form.

His name derives from the European confectionery known as marron glacé.