Just an idea for developers to create new enemies for upcoming seasons
Cerberus , Succubus , Chimara , Gorgon Rhino , Raptor , Werewolf , Phoenix , Vampire , Minotaur, Giant Toad , Cobra , Merman , Gargoyle , Witch , Warlock , Cyclops , Siren , Doppelganger.
Ooh, I especially like the idea of enemies that are the “evil” side of the characters, like minotaur or warlock. They could then use an “ultimate” in a similar way. I also like the undead version of some enemies, like Skelogre, that can expand already used ones. Another way of additional variety with less need for original coding.