"Younger Twin Sister"
She's a bit of a neat freak and neurotic. Unlike her athletic, tomboyish older sister, she is usually a quiet and reserved twin.
Because she is frail, her older sister helps her with many aspects of daily life, but when it comes to using her brain, their roles are reversed.
She serves on the library committee and spends her breaks in the library. She’s also exceptionally particular about organization and tidiness.
Because of her germaphobia, she dislikes being touched by anyone other than her older sister.
[From
official site]