The idea is this: you know the yin-yang symbol? How it's light-dark, and they define each other? I want something sort of like that, only the light and dark are both human profiles, one male and one female. He's the dark/yang part, and she's the light/yin part. The profiles aren't real detailed, just enough to show that they're male and female humans. (or elves, if elves are easier; I'm not picky about which).