Not sure on all of them ATM, because I don't have the MM with me. For now I have this.
Werewolf, because that guy does not look like he could give less of a Damn about being attacked by a ravenous were beast.
I will add a couple more when I get to my MM.
Its because that guy is actually Captain Marvel of the DC Marvel Family.
Next, I would have to say the Intellect devoured, because it just seems hilarious to hear so many horror stories about what they have done to a party, when it is literally just a brain with legs.
More than top 3:
Behir
Mummy
Gnoll
Merrow
Spirit naga
black pudding