So I have turquoise hair in the front and I have a few blue and purple ish streaks underneath. I have a Cosplay I want to do in the near future but I don't have the time or the cash to get a proper wig for it. (Korra from Legend of Korra) . My natural color is a dark brown and I just want to put a temporary dye over this and I'm willing to strip my colors a bit since they're fading anyways. What would be a good brand to use over it that would hopefully match my natural color and wouldn't become too distorted if I can't get all of the blue/green out?
You should try fading your color first; there are several methods discussed here:
http://www.hairdyeforum.com/index.php?topic=1704.0
You can try Adore for a semi-permanent natural color. They come in a variety of colors so you should be able to find something close to your hair color.