Syrians: Need a way around protection from capture. Also, needs better a character and enhancement pool
Sadducees: Need better characters and enhancements
Philistines: A protect fort. Ways around Ahimelek (and red in general).
Demons: Better enhancements, specifically battle winners. A protect fortress would nice too…
Romans: Another battle winner and some initiative characters
Pharisees: A decent way to counter FBTNB
Canaanites: Some better characters and one more decent enhancement
Babylonians: Another battle winner.
Heretics: More of 'em, easier ways to win battles and, be playable in T1
Brown and Pale Green don't really need much, IMO, so I omitted them. I'll try to do a list for good themes later.