Mion is a popular idol and model and is headstrong. She was born in Buenos Aires, Argentina. At an early age she had been with her parents and wandered the world, and is currently home to live alone away from home in Japan. She doesn't stop at saying her thoughts out loud and can be stubborn sometimes too. She tries to act like an adult most of the time. In the beginning she thought that the prism show was a waste of her time until she saw Aira and Rizumu perform in the Tiara Cup. She got her motivation back. She is actually very lonely without her parents but tries not to show it. She has, however, warmed up to Aira and Rizumu after losing the Summer Queen Cup. She seems to like and admire Jun even though he is 10 years older than her. It is hinted that she may fall in love with Wataru even though she likes Jun the best for now. She had gone on a date with Wataru to the fireworks festival despite having him carry all of her prizes. She has become great friends with Aira and Rhythm. She is actually afraid of dark places and ghosts or monsters. She had thought that Wataru was unreliable and depended more on Jun until he proved to her that he would protect her.