My favorite of all the non-humans is definitely Jack!!!
I'm not sure which one, though. Jack-5 was previously my favorite of them all, but from what I've heard, Jack-6 has better voiceacting so if it turns out to also have a good storyline it may become my favorite of them. We'll see.
In any case, I love'em humanoid robots!!!
....Except Alisa, of course. I like to bring into comparison the Jack series (pure awesomeness) with the Alisa model (utter crap). And WHAT are crazy anime characters like Alisa and Lars doing together in the same game with somewhat realistic-looking characters such as Miguel or Bryan???
I do like Kuma and Roger jr., I think they're quite a good and clever idea, and I can't decide which one I like best. The velociraptor, however, was so out of place, but anyway they realized it themselves and took it out of the cast.
I don't like Panda too much, however. It may be because she's Xiaoyu's pet, and I personally dislike that little japachinese brat. But it's also because Panda looks like she's constantly got a dumb smile on her snout - who's she, the Joker??
Mmmh, do Devil and Devil Jin count as non-humans, too? I'd have liked Devil if he was anatomically correct or if he wore pants; as of Devil Jin, I'm quite indifferent to him, but he still is funnier to play than normal Jin. I dig those black bird wings.
Oh, and Mokujin too. I really like him (and her) too. This was the best way to develop the concept of "character who uses all other characters'moves"; after Shang Tsung of course.