Yeah he has. He has angrily stated his name, appeared withered while dressed in a skirt-like thing and tried to suck a dude in a church.
That sounded incredibly hillarious.
Well, Zobek calls him the prince of darkness in the epilogue, and he crushed his Combat Cross and shit, he lost his humanity upon becoming a vampire, slowly becoming more evil. Then he mercilessly slaughtered Forgotten One and absorbed it's power.
Id say he will be a villain for part of the timeline, and then once we reach the epilogue, that might change. and he might become a more tragic figure again.