Want purple hair

If your hair is dark brown, then you will have to bleach your hair first. There are different brands, punky colors, manic panic, fudge. They make all different colors of the rainbow. I would wait a day after you bleach to add the color. The purple dye won't damage your hair but the bleach will if you leave it on too long. So maybe only do a few small streaks or just the tips of your hair, to keep it healthy looking. I hope this helps.

I think it depends on how willing you are to deal with a mistake. My helpful hints are to just do the front two strands, it's much easier, and I think cooler looking. As to what brand of dye to use after bleaching, I think Special FX is the best without a doubt. It holds much longer, and doesn't fade to the nasty colors the others do. The manic panic bleach kit works very well, and if nothing else, you can just leave front strands white blonde like Rogue from X Men.

I like Rouge's hair too but white hair is really hard to get and it's not totally white anyway.
Storms hair was white but occasionally had a Septic yellow tinge in some lights. It's a wig(unless Halle Berry has magic hair) so they should have gotten a whiter one.