I definately want the hobbes to return. I find them hilarious
I'd also like to see the balverines return, but maybe altered a bit so that they have more immunities to certain damage types. I'd like to see it so they can only be killed by silver augmentations or silver bullets. They could be damaged by other weapons but not killed.
As for dragons, I would like one or two dragons but not too many. The same goes for Krakens.
I would also like to see giants and ogres as this would make more of a variation as I got bored of only really having trolls as the big monsters.