First of all is not about mainly on how she looks but of what she is able to do physically.
So,
Practice any kind of martial arts/Sports/Arts (Any of them), to accomplish her fitness and abilities, learn how to defend yourself in order to protect others around as well.
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How to Be as Violet Evergarden
RandomThis Guide is to teach you how to mentally, physically, and socially become the ex-soldier and very famous writer character of the anime: Violet Evergarden. Now, this is not a 'superficial' guide that will tell you to dye your hair and to do cosplay...
