There are 10 enemies, confirmed (11 if you count Marionette/Puppet)
I only say that because that is the ONLY animatronic that doesn't have an AI to set.
That said, I'm currently trying to figure out:
1. WHERE DOES CHICA'S BEAK/EYES GO though I heard she removes them herself when she hunts for the player?? But that makes no sense
2. What gender is Mangle/Foxy 2.0 ???
3. Does Mangle/Foxy 2.0 even ATTACK the player?? I've seen every death animation from every animatronic BUT that one... which.. one of the 10 doesn't kill you, but jams up your lights/flashlight.
Considering the flashlight is the only way to deal with Foxy, that's inconveniently annoying. (along with that laugh that just never ends)
The easter eggs are even more interesting considering what time this game takes place. . . Though now that makes me even more curious in relation to the first game...