Kat

Kat is one half of the Mystical Ninja Elementary ninjutsu twins. When she's not in session for ninja training, Kat also attends the normal Diamond City kindergarten. But this young girl is anything but normal! With super-fast speed, high jumping power, shurikens in pocket, and the power to clone herself to confuse her opponents, it can be pretty tricky to not underestimate a seemingly harmless little girl like Kat! She also adores flowers and animals! Most of this also applies to her twin sister Ana, but the two sisters have some differences! Kat is the more bossy twin of the two, and her bossy nature can sometimes hurts Ana's feelings. However, like any sibling should, Kat still cares deeply for her twin sister, and is willing to do whatever it takes to keep the ninjutsu twins from splitting apart! 

(For Kat's voice, I will allow hers to either sound similar or identical to her current voice provided by Stephanie Sheh, or her voice in the older games provided by Leslie Swan. (It wasn't specified who voiced which twin, but I think it was probably Leslie Swan who voiced Kat.) Here's some voice clips for reference!)

Stephanie Sheh: https://youtu.be/7EPq8YXTZNY

Leslie Swan: https://youtu.be/5wtL50sEh-Q (I don't think there's ever any line the older voice of Kat has ever spoken on her own, so good luck deciding who's who if you want to go for this voice!)