[Psitticine]

Amazons of various types can be quite useful, as can Druids, Lizard Shaman (well, kinda), Knights, and a number of others. They sometimes offer something you don't have (like a different form of magic or the strength/speed combo of a knight) or can be important reinforcements for armies too far from other sources to be bolstered with national troops.

The various Wizards, Illusionists, Witches, and so forth add a lot of variety to what you can field. Don't overlook them!!!