Well, let’s see … there’s witches. Student witches (rowr). Yuki-onna. Medusa. Well, OK, technically, they’re Medusa Heads (which in some ways is even better … or perhaps not). Persephone (the ninja maid with the vampire vacuum cleaner). And then the wonderfol Alura Unes.
I think you may be onto something …
Hmm. Snake’s policy of on-site-procurement would have a bit of a problem in Drac’s castle, yes? So that’s where the ADV parts come in, he has to hit on the various female enemy characters and get them to give him weapons. So he can kill them. They’ll never expect that, which leads into the Metroidvania part of the game.