Malty S. Melromarc adopted the alias Myne Sophia to conceal her royal identity while adventuring. As the eldest daughter of King Aultcray Melromarc XXXII and Queen Mirellia Q. Melromarc, she held the titles "The First Princess of Melromarc" and "The Future Queen of Melromarc." However, her mother designated her younger sister Melty as crown princess due to Malty's reprehensible behavior. Malty displayed sociopathic tendencies from childhood, finding pleasure in others' suffering. Her father's excessive indulgence fostered her entitlement, while her mother's reform attempts, including study abroad in Faubrey, failed. There, she lost her virginity and encountered the corrupt King of Faubrey. She masterminded the summoning of the Four Cardinal Heroes using her father's influence, without the queen's permission. As Myne Sophia, she joined Naofumi Iwatani's party after his summoning as the Shield Hero. On the second day, she stole his possessions and falsely accused him of rape, leading to his ostracization. This act triggered Naofumi's Curse Series of Wrath and shaped his cynical outlook. Later, she manipulated the Spear Hero Motoyasu Kitamura by gifting him Naofumi's stolen chainmail and feigning victimhood. She exploited his trust to levy oppressive taxes and nearly orchestrated the theft of Naofumi's enslaved companion Raphtalia. She used her physical attractiveness and feigned affection to control men; her mother confirmed she "used her own body to gain benefits." When her false accusations were exposed during a royal trial, Queen Mirellia stripped Malty of her royal status and titles. At Naofumi's request, her legal name was changed to "Bitch," and her adventurer alias Myne Sophia was replaced with "Whore." A subsequent rebranding as "Witch" marked her as a wanted criminal. Though she hypocritically begged for mercy during her trial, pleading that "revenge breeds further revenge," she expressed no genuine remorse and intensified her vendetta against Naofumi. Exiled from Melromarc, she joined the interdimensional terrorist organization Vanguard of the Waves. She manipulated events across worlds, instigating the assassination of Queen Mirellia by the tyrant Tact. Her actions also indirectly unlocked the Curse Series of the other heroes: Motoyasu's Lust after she abandoned him, Ren's Greed and Gluttony after she robbed him, and Itsuki's Pride through her exploitation. In the web novel continuity, her execution involved burning at the stake following her role in her mother's death, with her father condemning her as a "shameless woman." The light novel later revealed her as a soul fragment of the goddess Medea Pideth Machina, embodying Medea's worst traits. After Medea erased Naofumi from existence, he retaliated by erasing both Medea and Malty across all timelines. Her personality consistently demonstrated pathological selfishness, grandiose self-worth, and near-total lack of empathy. She employed superficial charm and compulsive lying to manipulate others. Yet her short-sighted decisions, like betraying allies despite lacking leverage, and inability to detect hostility made her vulnerable to counter-manipulation. Figures like Biscas T. Balmus and Rino exploited her narcissism to betray her; Rino fatally stabbed her during one scheme.