I can already confirm there is an absurd amount to list. There are quite literally hundreds. I dont know if every type can also be every class, the most i have is 7 of the same class, which is enough to realize how big this list could get. Also the 'families' come in different forms as well, like Goblins, Goblins-Aqua, and Goblins-Sand. I have Orcs and Orcs-Snow. Also if you look at the marketplace, you can see there are hundreds more available. First day i was dying for a list, until i realized just about everything in the world also has a counterpart.
Also, the 'Boss" spawners seem to be much more rare and also far less abundant. Perhaps a list of just those would be alot more managable. And would be a very welcome thing indeed as I have only a couple, and would kill for more to make a more realistic dungeon (at least 5 or 6). Also since you can only place a single one of each, would be nice if those came in different classes as well. So i dont have to keep reaching outside of the "Theme" to fill a dungeon. My poor vampire lair I have "Imprisoned", "Coercered" or "Summoned" the bosses, lol.