She is willing to help anyone in need no matter the situation. Rein is very adventurous and brave. Rein is also caring and eccentric, coming up with positive and intelligent solutions to problems.

Rein doesn't mind losing the Princess Parties as long as she can make those around her proud.

Rein becomes embarrassed when her twin Fine is unable to eat and cries. She has an overactive imagination and sometimes jumps to conclusions as a result of not having the whole story and simply going.