Mjurran, also known as Mjur Farmenas, began as a witch in the Jura Forest. She endured persecution and isolation from humans and majin alike, driving her to focus solely on magical research and withdraw from society. Facing her lifespan's end filled with regret over unfinished work and no successor, she became vulnerable. The Demon Lord Clayman exploited this, offering eternal youth and life in exchange for her service. Unaware of the trap, she accepted and was enslaved by the cursed spell "Marionette Heart," becoming Clayman's puppet. Attempts to remove the curse would revert her to her aged state and kill her, forcing her obedience. Her life changed upon meeting Youm, a human who saw through her disguise and accepted her true majin form. He became the sole person to win her affection and trust, offering genuine connection and hope. After Clayman's defeat, Rimuru Tempest freed her by replacing the Marionette Heart with an artificial heart that restored her youth without the curse. This act secured her deep loyalty, leading her to swear fealty to Rimuru. Though surprised by his casual acceptance, she reevaluated her views on trust and commitment. Mjurran possesses a highly responsible and meticulous personality, carefully planning to secure favorable outcomes. Her enslavement made her cautious and wary of deception, though she remains somewhat naive in love due to lack of experience. Despite disliking politics and experiencing social anxiety in large groups, she serves as a conscientious and kind Queen of Farmenas, prioritizing her people's well-being. She values her friendship with the lycanthrope Grucius as her first genuine majin friend. As Queen of Farmenas and wife of Youm Farmenas, she plays a strategic role in Rimuru's plan to covertly integrate the former enemy nation as a vassal state. She conducts supporting research and actively fosters cultural ties with Rimuru's city, replicating its holidays and festivals to create a festive, inclusive atmosphere in her kingdom. She is among the few aware of Raphael, a powerful skill entity affiliated with Rimuru. Her majin heritage grants her a non-human true form featuring a third eye on her forehead, body tattoos, monstrous claws, and patches of fur, which she typically disguises. While conflicted during her time as Clayman's spy—disliking political manipulation and chaos—she maintained a strong moral compass, often assuming blame for actions forced upon her as a pawn.