Yaten Kou is a fictional character from the anime and manga series Bishoujo Senshi Sailor Moon. Yaten is one of the members of the Three Lights, a popular idol group, and is also the alter ego of Sailor Star Healer, one of the Sailor Starlights. Yaten is known for being sharp-tongued and aloof, often keeping a distance from others. Despite this, Yaten has a deep sense of loyalty and responsibility towards their mission to find Princess Kakyuu. Yaten's character adds complexity and depth to the series, showcasing themes of identity and duty.