I love so many of the characters.
Kate as the cop who gets the supernatural shoved down her throat. It is nice to see how she deals with it all.
Fred, mostly cause smart women are hot.
But, ultimately, I've gotta go with Wesley. It is really nice to track the evolution of his character throughout the series. He stumbles whenever his father is involved, but he truly makes a good leader. It was really nice to even see him teach Gunn that you've got to sacrifice someone, sometimes, for the greater good in Pylea.