Yup, we are the second or third least played class
Yes!
As I explain above, lorewise we are able to go out and enslave anything, it’s just not mechanically there.
Also Felhunter is a demon dog. He’s animalistic, and presumably an animal from a Legion world turned into a demon that they kept reproducing. If we did the tame/enslave mechanism, one of the slots would be demonic animals/bestial demons.