Welcome to the Tsundere or Not poll #33. Decide the character's level of tsundere-ness and give them a score in the poll rating meter. In scale of 1 to 5, rate them according to what you’ve learned in the anime, manga, novel, etc.
A tsundere character posses similar qualities and traits which defines who they are. The simple definition of this character archetype is available in our club page but you can read further at the Wikipedia entry for the broader definition.
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I don't think she has the romantic deredere side either. What I see is that her normal personality would be deredere but she gets particularly tsuntsun at Subaru or towards anyone who might tease her. I'd give her a 4 for non-romantic tsundere.