Mjurran, later known as Myu Farmenas, began as a human witch persecuted and isolated within the Jura Forest. Centuries of solitude fueled her dedicated magical research. Facing mortality with regret over her unfinished work and lack of an heir, she accepted demon lord Clayman's offer of eternal youth and life in exchange for service. Unaware of his deceit, she transformed into a majin—a demonic entity—when Clayman replaced her heart with the controlling "Marionette Heart." This bound her as the "Ring Finger" of his elite Five Fingers, compelling her to obey while she secretly loathed his cruelty. Her usual appearance features an elegant human woman with mint-green hair often tied back, wearing a ferronnière. Her true majin form reveals a third eye, multicolored eyes, feathered ears and limbs, facial tattoos, and clawed hands. Social anxiety plagues her in crowds, a remnant of centuries of isolation and betrayal. She maintains a reserved, cautious nature, a strong moral compass, and meticulous strategic planning, often internalizing guilt for actions forced upon her. Naivety in personal relationships stems from lacking prior meaningful bonds. As a sorceress, she specialized in strategic magic over combat, employing earth manipulation for traps, wind-based oxygen deprivation, and city-scale barriers that suppressed communication, teleportation, and internal magic. She prided herself on intellectual tactics, rejecting brute force. Sent by Clayman to infiltrate the Jura Tempest Federation, she joined Youm's security as a strategist after defeating him. Tasked with spying on Rimuru Tempest, she instead formed genuine bonds and trained Tempest's forces. When Clayman threatened Youm’s life, she activated an anti-magic barrier over Tempest during an invasion, enabling heavy casualties. Consumed by guilt, she confessed to Rimuru and accepted death. Rimuru staged her execution to destroy the Marionette Heart, replacing it with an artificial heart to free her. Liberated, she aided Shuna in soul containment during Tempest’s resurrection and witnessed Rimuru’s power. She married Youm Farmenas and became queen upon his coronation in the Farmenas Kingdom. Despite political discomfort, she embraced the role, striving to build a just, festive society inspired by Rimuru. She balanced royal duties with raising her daughter, Mieme. Her rivalry with Grucius evolved into deep respect and friendship after a pivotal duel. In the spin-off "Clayman’s Revenge," a kinder Clayman returns her heart voluntarily. Moved by his change, she pledges authentic loyalty, becoming a formidable advisor in his forces and developing a competitive rapport with subordinate Rain. As a majinized human demonoid, her centuries-long lifespan ensures she will likely outlive her human husband unless he extends his life.