I use Lae'zel for my evil run, but she does have kind of that evil cat vibe. Like how every cat not only acknowledges it is a cat, but somehow feels that it is the epitome of what it means to be a cat.
Also, as I think it's pointed out, githyanki are canonically space Nazis. Early in her character arc there is definitely the notion that she is only helping you to help herself and that she has no problem with "final solutioning" you.