My main "sona" is a deep pink-red, with greyish undertones and mane, faded pink stripes down her body, and a golden necklace to match her eyes. <3
There's nothing wrong with making an all red and black character..though those two colors are quite overused. Maybe just mix it up, add another color in there, so it looks a bit more original. ^^"
After all, part of what makes a character "unique" is the story behind it, not just the color scheme.