Margaret Odius (also spelled Odeus) hailed from Dartagnia. She served as the primary contracted mage to Lord Villar Constance and was an upperclassman to Siluca Meletes at the magical academy. Twenty-five years old, Margaret possessed a distinctive appearance marked by deep carrot-orange hair cascading to her waist, golden eyes, and tan skin, typically clad in a red and black dress.

Her personality blended impulsiveness with fierce loyalty, directed intensely towards Villar Constance. She exhibited extreme aggression against anyone who slighted him, while privately harboring deep romantic feelings that surpassed their professional contract. This devotion directly defied Villar's policy of releasing his mages upon reaching age 25.

Specializing in potent fire magic, Margaret earned the epithet "Hellfire Margaret." Her combat prowess centered on fire manipulation spells, deployed effectively during Villar's military campaigns.

Margaret's development centered on her bond with Villar. Despite the contractual obligation to dismiss her at age 25, she secretly returned to Altirk following Milza Kuches's betrayal of Villar. She joined Villar's final stand against overwhelming odds, fighting beside him in a decisive battle. Both sustained mortal wounds during this confrontation. Their story culminated in a shared death scene that affirmed their mutual devotion, concluding her character arc.