Male: Lelouch vi Britannia from Code Geass, Izaya Orihara from Durarara (Johnny Yong Bosch's laugh for them is awesome!), Sebastian Michaelis from Black Butler.
Female: Shinku from Rozen Maiden, Mikasa Ackerman from Attack on Titan.
Not too sure really. I haven't watched that many anime, so the characters from the latest show I've seen usually end up topping my favourites from before. But this is my current top 3: