Brahne was definatly evil, I mean someone who tries to kill there own child (even if adopted) is evil. All she wanted was power and wealth and lots of it, good person before her husband died...

I highly doubt it. Kuja was mabye only using Brahne, but I dont think she was hypnotized or anything I'd like to think that it was 50/50 between them both using each other for there own ends. And as for that whole I'm sorry act she protrayed just before she died, I think that was more for herself then anything else.