Finally figured out the pink and purple vampire. It was Dracula himself, resurrected as a superhero.
He had a girl sidekick and they both wore their underwear on the outside.
Then we had the new Frankenstein.
And the Werewolf too!
Don't know how the whole underwater thing worked out, but I bet he smelled like wet dog.
I can remember the Dracula and Frankenstein books. I wasn't very wowed even as a kid.