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[Not a Lawyer, nobody's a lawyer here] Double, triple and quadruple down, make them Creative Commons. I don't think said person have copyrighted them, but if she did, that's already grounds for ex...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/33106 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
[Not a Lawyer, nobody's a lawyer here] Double, triple and quadruple down, make them [Creative Commons](https://en.wikipedia.org/wiki/Creative_Commons_license). I don't think said person have copyrighted them, but if she did, that's already grounds for exterminating the human race. Back to the point, creative commons and public domain are like the Death Stars of copyrighting, because They're simple and powerful. You can't claim Greek mythology (a public domain) to be your invention, nor can anyone else. If your characters are under a specific creative commons license, you can keep them, and they can't be claimed by anyone else as their own, though they still can use them _(down here in the internet's darkest pits, we call this use fanfiction/fanart/r34)_ but must credit you as the original creator. Though I must say, does she really know and makes them better than you, their creator, does?! If not, you can point that out to her. However, if for instance, I have to choose between Reki Kawahara's Kirito or his abridged persona, created by [Something Witty Entertainment](https://www.youtube.com/user/SWEabridged/videos), I'd chose abridged Kirito as he was **A BETTER CHARACTER THAN THE ORIGINAL by 200%**. Seeing other people handle characters better than their creator is nothing new, and it can be boiled down to these "fixers" being unbiased, easily recognizing the flaws of a character and **seeing them for what they really are**.