Miime stands as a significant figure across the Space Pirate Captain Harlock franchise, her portrayal varying between adaptations while her core identity persists: the sole survivor of her species. Her people perished on planet Jura, devastated by nuclear warfare and an environmental collapse triggered by sentient plant life. Discovered amidst this desolation by Captain Harlock, she found refuge aboard his starship, the Arcadia. Profoundly grateful for her rescue, she pledged unwavering loyalty and her life to Harlock, vowing to follow him even into hell.

Physically, Miime exhibits distinctly alien features. She possesses a tall, willowy frame and long, flowing hair, depicted in various media as purple, blue, or green. Her most notable traits are pupil-less eyes—often yellow or green—and the absence of a visible mouth, attributed to her Juran physiology. This lack of a mouth does not hinder her telepathic communication or her ability to absorb liquids, particularly alcohol, which serves as essential nutrition for her species rather than merely an intoxicant. She is commonly seen wearing a long, loose-fitting lavender dress.

Her personality radiates profound calmness, wisdom, empathy, and sensitivity. She maintains a serene, observant demeanor, sharing strong camaraderie with the Arcadia's crew though her deepest bond remains unequivocally with Harlock. She holds deep faith in Harlock's beliefs and leadership, understanding the harsh "kill or be killed" reality of their existence. Despite her peaceful nature, she demonstrates fierce courage and protective instincts, readily employing combat skills or latent psychic and psionic powers when Harlock or the crew faces dire threats. Her empathic abilities make her a valuable counselor, offering comfort and solace to distressed crew members.

Aboard the Arcadia, Miime holds no formal position; her presence is one of voluntary support. She frequently engages in shared activities with Harlock, such as drinking wine—often the potent "Red Bourbon"—and playing music, originally a lap harp whose melodies soothe Harlock and ease crew anxiety. Her relationship with Harlock transcends conventional labels like romance or friendship. It is a profound, intimate bond grounded in mutual respect, unspoken understanding, and shared experiences of isolation, loneliness, and grief from their tragic pasts. They confide in each other, with Harlock sharing plans, doubts, and memories, while Miime acts as his advocate and interpreter to the crew, clarifying his motives and assuring them of his resolve. Their interactions carry ease, dignity, and significant yet comfortable physical distance, reflecting their status as autonomous individuals bound by choice.

Her portrayal experiences notable variations across official media. In the *Harlock Saga* OVA, her origin shifts; she is reimagined as a member of the Nibelungen clan. Her musical instrument becomes a pipe organ, and she gains the ability to manipulate time, serving a crucial role operating the Arcadia's dark matter generator. These alterations were abandoned in the subsequent *Endless Odyssey* OVA, which reinstates her original Juran origin, mouthless design, and harp-playing trait. The 2013 CGI film *Space Pirate Captain Harlock* offers another distinct interpretation, depicting her with a visible mouth while retaining her non-human physiology and psychic capabilities. Despite these adaptations, her core narrative function—Harlock's devoted companion, confidante, and a being defined by tragic loss and steadfast loyalty—remains consistent.