Elena: ESxJ. She interferes in everybody elses' buisness too much to be an I.
Steffan: ISFJ , but the whole TURN ON BLOODLUST, TURN OFF EMOTIONS bit makes shit difficult.
Damon: ENxP. He's either a maldeveloped T or F. His feeling side is either underdeveloped, or screwed up.
Katherine: ENTJ <--- Sexiest character in the whole damn show.
Yeah, I'm a guy, I watch Vampire Diaries. Problem? PROBLEM?
Oh, and the originals, forgot about them:
Kol: Uhhhh.... ExTP