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Probably a good idea to list someone she knows. I have Fort Hajime with some people she could have trained with. Be warned, Eriko once ST'd someone back to life in order to beat them up!! :0
I made a few small edits, added some links, fixed some typos.
The only issue I have is that the mention of Ninjutsu comes out of nowhere and doesn't match the rest of the character. I think it would work better if you reworked that Skill to just say she knows SACQC and is working on fleshing out her personal style that uses two handguns. You may also want to highlight the pros and cons of this style, since you're losing out on the free hand you'd use for strikes, throws and joint manipulation.