Although her attack, Star Sensitive Inferno is probably the most powerful of all the starlights attacks.
Yaten, along with Taiki(Sailor Star Maker) is reluctant to help Sailor Moon, but at the end, Princess Kakyuu's death convinces her to become friends with Sailor Moon and help Sailor Star Fighter protect her from Galaxia.

Sailor Star Healer is also known as Yaten Kou, another member of the 'Three Lights' She is seen as very obnoxious and uncaring at times, but she is truly very kind and caring, she just doesn't show it very much. Yaten loves cats and finds a soft spot for Luna, but her thoughts are mainly focused on finding Princess Kakyuu, which is why she is so rude to everyone. Yaten doesn't like having to be the centre of the world as a Three Light and truly hates being admired by fans that don't know their true selves. You could say that she is the most devoted of all the Starlights because finding Princess Kakyuu never left her thoughts. Yaten hates any form of physical exertion and prefers photography, which is one of her favorite past times and subjects in school, along with art. As Sailor Star Healer, she is not only the shortest, but the weakest physically.