User blog comment:PDXBlazer/Favorite Wesen?/@comment-24.19.38.105-20120319035428

One of the drawbacks to the show's "monster of the week" format is that most Wesen only get one episode -- sometimes only half an episode! -- to make an impression. The only notable exception has been the Blutbaden, who've been the center of a whopping three episodes so far ("Pilot," "Three Bad Wolves," "Let Your Hair Down."). Compare that to the Bauerschwein, who we know pretty much nothing about aside from their love of mud baths and their feud with the Blutbaden, because they got so little screen time in "Three Bad Wolves."

At this point, the only reasonable answer to this question would be "Blutbaden," since none of the other species so far have made anywhere near the impression that they have.