Kou Yaten is one of the members of the Three Lights idol group, and is the civilian identity of Sailor Star Healer.

Yaten is a 10th grade student at Juuban Municipal High School, and is the most artistic among the group. 

She does not interact much with people around her. According to Takeuchi, she is a jerk and egotist. She has never carried anything heavier than chopsticks and the most unpleasant thing she can face is injuring her face or body. She is very delicate, nervous and always holds grudges.

 

Sailor Star Healer is the shortest of the Sailor Starlights.

 

" http://sailormoon.wikia.com/wiki/Kou_Yaten "

 

Yep. Yaten is a boy but he  transforms into a girl when she's in her Sailor outfits! So funny X)