I agree with Ichigo-- those characters have two totally different colours, and unless you dye the wig, I don't think one is going to work for both.
Going to con with only one cosplay can actually be a lot of fun, though! If you're really not up for that, though, you could always pick a cosplay that would make use of your natural hair.
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- Fancy Mewtwo Gijinka (Cowslip Gijinka): 24% (Sewing) Otakon 2014
- Secret Cosplay (???): 97% (Final Touches) Otakon 2014
- Magic Armor Link (LoZ: Twilight Princess): 15% (Patterning) Katsucon 2015
- Emperor Lelouch (Code Geass): 2% (Planning) Katsucon 2015