Create a character with personality traits of someone you love, but the physical characteristics of someone you don’t care for.
From my story White Noise:
Aiden is Lassie's boyfriend and very much one of the those men you see in magazines and ads. He's tall, thin and his face is very sharp and angular, with cold blue eyes and dusty brown hair. His expression is usually severe, due to the angles of his face, but his voice and demeanor is surprisingly calm and understanding. If you can get past the unfriendliness of his looks, you'll actually find a person who is secure with themselves and stopped caring a long time ago what other people thought of him. He's loving and caring around Lassie, always willing to listen to anything that comes up even if it sounds strange or unbelievable. After all, Lassie lives in a very different world from his own, and even though he usually doesn't understand it, he at least tries and listens.