I really like the lupine and goatkin options that are coming. I’ve suggested insectoids before, but here some new ones:
Ursine (bear)
Primate (apes)
Ikthians (fish)
I would expect color schemes for bears ranging from black, brown, white, and panda.
Fish could be versatile like lizards are, with great white, hammerhead, angler fish, eel, etc. options for face/head.
Add a heavy water-focused tome with them (Nature/Dark or Nature/Materium). Something that melts ice without fire, or drenches a target with Wet. Possibly add some kind of Slippery terrain status that would reduce movement. Even a straight up Deluge spell that just does physical damage.