Movie
Description
Kō Yaten is the civilian identity of Sailor Star Healer, a member of the Sailor Starlights from the planet Kinmoku. In the film Pretty Guardian Sailor Moon Cosmos the Movie, Yaten, along with the other Starlights, comes to Earth in search of their princess, Kakyuu, after their home world was attacked by Sailor Galaxia. To avoid drawing attention, the trio disguises themselves as male idols in a pop group called the Three Lights. Yaten serves as the keyboardist for the group and adopts the stage name Kou Yaten while attending Juuban High School alongside the main characters.

In terms of background, Yaten is from a distant star system and has been trained as a Sailor Guardian sworn to protect Princess Kakyuu. The destruction of Kinmoku and the loss of their princess shape Yaten’s entire mission on Earth. Yaten’s personality is marked by a strong sense of isolation and cynicism. Yaten prefers not to socialize or interact with others beyond what is necessary for the mission, and remarks are often sharp‑edged and blunt, which keeps most people at a distance. The character shows little interest in school activities, disliking physical exertion and sweating, but enjoys artistic pursuits such as photography and art. Among the Starlights, Yaten is the most spiritually aware, able to sense when Starseeds are taken by Galaxia’s forces.

The central motivation for Yaten is to locate Princess Kakyuu and ensure her safety. Initially, the Starlights view Earth and its inhabitants as unreliable and wish to complete their search as quickly as possible so they can leave. This cautious, even distrustful attitude extends to the other Sailor Guardians, including Sailor Moon. Yaten, along with Taiki, believes that Seiya should stay away from Usagi even after learning she is Sailor Moon, reflecting a desire to avoid entanglement in Earth’s conflicts. However, as the story unfolds, Yaten gradually becomes more willing to work alongside the Earth’s guardians.

In the narrative of Cosmos, the Starlights play a crucial role in aiding Sailor Moon against Shadow Galactica. After reuniting with Princess Kakyuu, they join forces with Sailor Moon and travel to the Galaxy Cauldron. During the journey, Yaten and the other Starlights are killed by Sailors Phi and Chi. Despite this, they are later revived after Galaxia is healed, and they return with Princess Kakyuu to restore their home world.

Yaten’s key relationships include the bond with fellow Starlights Seiya and Taiki, with whom they share a deep loyalty and common purpose. The character also forms an unexpected positive connection with Luna, Sailor Moon’s cat advisor, who provides encouragement during moments of doubt. While Yaten initially regards the Earth’s Sailor Guardians with suspicion, the shared struggle against Galaxia fosters a grudging respect and eventual cooperation.

No significant personal development is shown in the film beyond the Starlights’ collective arc, but Yaten’s ability to put aside personal reservations to fight alongside Sailor Moon indicates a degree of growth in trust and commitment to the larger cause.

Sailor Star Healer’s notable abilities include the transformation phrase Healer Star Power, Make Up, which allows Yaten to assume the Sailor Guardian form. In battle, Yaten wields the attack Star Sensitive Inferno, a concentrated blast of energy. The character also possesses heightened intuition regarding the removal of Starseeds, a unique sensitivity among the Starlights.