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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- Emperor Lelouch (Code Geass): 4% (Planning) Otakon 2015
- Hilda, Player Character (Pokemon Black/White): 32% (Sewing) Otakon 2015
- Magic Armor Link 2.0 (LoZ: Twilight Princess): 5% (Armor Revamp) Summer 2015
- Pyrrha Nikos (RWBY): 1% (Planning) Otakon 2015