MONSTER MASHUPS #88

 The 1997 music video "Everybody (Backstreet's Back)" shows the Backstreet Boys dreaming that they've become (going left to right) a vampire, the Phantom, a mummy, Jekyll-Hyde, and a werewolf.

CROSSOVER MADNESS

 Some crossovers in which a "novelty-icon" crosses over with some version of "familiarity-icon" Dracula:

Here's BLACULA and Dracula.

Vampirella of the comics meets Big Drac.

And here's film-Vampi trying to throw Drac "down for the Count" (see what I did there?)

NULL-CROSSOVERS #10

 Purely because I've introduced the notion of "proto-crossovers" here and elsewhere, I'm going to specify that repeat appearances of Subordinate heroes, heroes who have never been Primes in any iteration, don't build up any "crossover mojo" no matter how many times they appear in the same feature in which they originally appeared. This is true for both the first Batwoman and the first Bat-Girl, who qualify as a type of "null-crossover" whenever they appear in any BATMAN story.

However, if such a Sub appears in another feature wherein he or she did not originate, that is a charisma-crossover. This extends even to features that may include the hero of the parent-feature in a different configuration, usually a team-up. The cover of WORLD'S FINEST #104 includes two such charisma-crossovers because the feature is the combination of both Batman and Superman (and usually Robin as well). Batwoman isn't part of Superman's cosmos, any more Luthor is part of Batman's cosmos, so this presents two crossovers for the price of one.