What's the best type of hair dye brand to use for natural hair?
I would use something natural. Use real henna (not from lush) if you want natural colors, or use a vegan hair dye like Artic Fox or Punky Pop if you want a bright, fun color. Keep in mind that you'll still have to bleach your hair for the more "fun" colors, and that it's better to have a professional bleach or tone down your hair. But it is possible to safely do it yourself.