I would have to say all of them I adore the whole Klingon culture its amazing and very interesting.
Worf is of course my favorite Klingon but as luck would have it in two weeks I will get to personally meet non other than
Chancellor Gowron (Robert O'Reilly) and General Martok (JG Hertzler) in person among some others from other shows....
Im thrilled...
I even have a Klingon greeting ready for them LOLOL!!!!
Q'apla