I used to have the same issue with having similarities between characters that beheld similar personalities and details as to what you described. I broke away from the mold eventually, mostly just using inspiration and taking minor tidbits from various tropes that I read up on. Switching around helped a lot as well, to what Ten suggested.

Mags herself is the first of her kind, for me at least. But then I prefer darker characters in general.

The spectrum of "evil" is a little more difficult to discern, I'll admit. Some villains tend to blend in together for me, even my own.