Ideas for mini boss (tier three or four) enemies
Cat: a lion or tiger girl
Harpy: a dragonoid of some kind
Ram: a seductress ram of some kind
Fox: a stronger spirit caller of some kind (or just an enemy version of the special spirit with some of it's previous power unlocked)
Wolf: just a stronger tar wolf I've got nothing
Imps: succubus... No further explanation needed
Lamia: gorgon of some kind