This might have been discussed before, but I'd still like to raise this point.
Some things seem easy enough to place, but I see a lot of borderline creatures.
Faeries stem from the belief of the mortals, so whatever they believe in and tell stories about, will exist. Yes?
So the elves of the woods, the dwarves of the deep, mermaids, goblins, sprites, satyrs etc. are all Fae. Also, it seems most non-christian, pagan gods get placed in the Faerie box as well. After all, it nobody believes in them and talks about them, worships them even, they lose all power, or die/cease to exist.
The Infernal and Divine Realms seem absolute, so it doean't matter if you don't believe in the demons - they can still get you!
IIRC creatures of the Magic realm has included Dragons, Giants, Ghosts although ghosts could easily also be Infernal or something else).
But aren't Dragons also the stuff of legends? Perhaps this is one instance of a creature being the cause of the myth, and not the other way around, as for Fae.
How about Werevolves (or other Were-creatures)? Magic or Faerie?
Vampires? HoH: TL in the Tremere chapter list vampires (or at least some form of vampiric creature) as a Dark Faerie.
And what else if left in the Magic Realm? Fantastic beasts, such as Hydras, Basilisks, Gryphons, Chimeras? Pegasi? And how (for same reasons as the other creatures listed) do they not fall into the Faerie category?
How do you other people differentiate?