To unlock the character "Hybrid" complete the game on any difficulty level with either the Vampires or the Lycans.
A message will appear saying you have unlocked him.
Hybrid is a strong character that can be used on a Vampire game or a Lycan game. His special abilities are those of the Vampires and he cannot use weapons, only hand combat.
Hybrid cannot be saved. As soon as you reset your console he won't be available until you complete the game again. However, his stats will be the same as you left them.