Marron Glace is Carrot Glace's younger brother, though his greater height and mature bearing often suggest he is the elder. Persistent childhood bullying targeted his feminine features, with Carrot always acting as his defender. This dynamic reversed during their teenage years, transforming Marron into a fiercely protective figure over Carrot, their friends, and especially his older brother when threats arise.

He wields Eastern-style magic, employing paper wards akin to Shinto ofuda and demonstrating mastery by conjuring the Four Symbols. While also a skilled swordsman, he rarely uses his blade in actual combat. A significant vulnerability is his complete inability to tolerate alcohol, a trait prominently explored in the manga.

His personality remains consistently docile, level-headed, and gentlemanly, forming a stark contrast to Carrot's impulsiveness. This protectiveness manifests as intense devotion towards his brother, occasionally bordering on overt affection within the manga. It includes visible embarrassment over Carrot's antics coupled with unwavering loyalty whenever Carrot faces danger.

Despite being actively pursued by Gateau Mocha due to his physical beauty, Marron largely ignores these advances. While some narratives imply homosexuality, multiple sources explicitly define him as asexual. He was raised alongside Carrot and the Misu sisters on Mt. Saint Hordic, the sanctuary for Sorcerer Hunters. A later revelation identifies him as the human reincarnation of Yaksha, the God of the East, directly linking to his Eastern magical practices.

His role within the Sorcerer Hunters team remains fixed across all media, consistently functioning as the calm strategist and primary magical combatant. His core traits and abilities show no significant evolution or deviation throughout the series, OVAs, or manga. OVA episodes depicting hot spring relaxation and cherry blossom festival attendance introduce no new character development or backstory elements.