Since vampires exist, I should probably be a bit more open-minded about the supernatural. I figured I might as well make a list for more public reference, even with my flawed knowledge of it. I'm including everything I've heard anything about, even if I have doubts. If you want to know more, turn to the Nosferatu. I hear that their invisibility and natural experience with hiding works wonders for gathering intelligence.
Vampires: We're real. We also vary greatly in danger.
Ghosts: Also real. Going by how many stories I hear about them compared to the others, they're not even that rare.
Werewolves: Probably real. Nothing like you'd think if they are. Way weirder, way deadlier.
Wizards: Inconclusive. They probably used to exist, but the trail goes almost completely cold after the rise of natural philosophy. Alternative medicine forums and new age circles may be linked to them if they are real.
Faeries: Unlikely. I've heard a malkavian mention them, but not much more than that.
Zombies: Plausible. I've heard about them, but they seem to have a hard time actually getting the numbers they'd need to get out of control.
Magical girls???: Unlikely, but also not the least believable thing here for a seemingly mundane world. Also malkavian sourced, but less blatantly contradictory than the faeries.
Mummies: Inconclusive. They'd be pretty much impossible to discover without killing a random person and standing guard over their body for a year from what little I've heard.
Demons: Probably? I've heard a bit, but the term seems to be used very loosely for any kind of misanthropic spirit.
Spirits: Likely. Ghosts and demons both seem to be out there, so I wouldn't rule out other immaterial stuff.
Hunters: Obviously. They don't feel like they should fit given that they're usually just regular people, but apparantly they can pull off some seemingly supernatural tricks if you get especially unlucky.
Seers: Wouldn't surprise me at this point.