Miku, designated Code 390, is a former Parasite of the Thirteenth Plantation and a main character in DARLING in the FRANXX. She was raised in the Garden alongside the other children, where she knew Zorome from a young age, and was later assigned as his partner to pilot the FRANXX Argentea. In terms of appearance, Miku is a girl with red hair and blue eyes, and she is often noted for being fashionable and physically attractive. Her personality is lively, confident, blunt, and outspoken. She can appear cheerful and innocent on the surface, but she is also notably selfish, deeply competitive, and hates losing more than anything else. This competitive streak is shared with Zorome, though his immaturity frequently irritates her, and the two often bicker and lash out at each other. Despite their constant arguing, Miku and Zorome share a strong bond built on trust, which is essential for piloting their FRANXX. Miku is not afraid to speak her mind, even if her words are hurtful, and she has openly criticized other squad members, including Ichigo, when she disagrees with their decisions or leadership. Her primary motivation as a Parasite is to prove herself and succeed in her duties, and she generally strives to achieve recognition. Over the course of the story, Miku develops alongside the rest of Squad 13, learning more about herself, her emotions, and her relationships with others, particularly Zorome, as the children begin to experience feelings and concepts that were previously foreign to them. As a pilot, Miku serves as the pistil of Argentea, the FRANXX she and Zorome operate, and her ability to synchronize with her partner is critical to the mecha's function in combat against the klaxosaurs.