Yuki is very shy and doesn't like public speaking, so she prefers to study or read comics books. She is a total geek and has no friends but she is the most powerful hero. Her dream is to become an idol, which is why she eagerly accepted to join the group of heroes when they approached her as "idols". She is very naive and gullible and only wants to be accepted, but her naivete leads her not to realize when she was being manipulated. It is her fatal flaw, and it causes her to have low self-esteem. One thing no one knows about Yuki is that when she was a kid, she was in a car acident and forgot everything about her childhood, including friends and her life in general. She has a relatively high pitched voice.