People forget we got human villains in TF: Animated. I was at the con when it dealt with TF: Animated and they showed some pictures on the human villains. Probably the one I believe will be a fan fav would have to be The Angry Archer. A character based on Aaron Archer. I'm not 100% accurate since I only saw a glimpse of it at the Botcon.
Aaron Archer is the design director for Transformers, as well as being a fan himself and a great guy. It's a tribute character, even had a passing resemblance to him (and yeah, the drawing was quite a bit heavier).