I personally think Ronnie and Vlad were a waste of potential.
I mean, sure, they have a role ("People you can slaughter and then go back to your home and sleep like a baby") and they fill it competently, but....
I'd have liked to see them play up how Ronnie is this broken, solitary creature who feels the only way to make a connection with someone is to eat them, and her wish is to make everyone like her so that she won't be alone anymore.
That's all kinds of messed up, but I think the writers could have mined that for a bit more than "Kill it with FIRE!"
Likewise, I actually like Extra Vlad's exuberance, he's clearly having a grand old time in the Moon Cell (although perhaps the "I'm going to thrust my spear into you! And by spear, I mean PENIS! BWAH HA HA!" Could be toned down somewhat.)
I would have preferred to see something that played off of Ronnie as the monster that dislikes its existence and Vlad as the monster who rejoices in its existence, a bit like Kirei and Gilgamesh in Zero.
Or maybe I've just put way too much though into the plight of an insane cannibal clown and her Servant, the Lord Impaler (WITH PENIZLOL!).