generally most blacks are somewhat useful , if not top tier. As eab said, silver rogues are pretty bad.


Actually talking about silvers : Elaine is not that great of a duelist either , but u can use her as a cheap deploy for goblin rushes i guess. silvers archers have their uses , healers are okaish , maybe the male healers since they heal less....but they can be used for male maps. Generally silvers roques/duelists are crappy in this rarity.


Golds : Robert (or whatever the male gold healer is). Is the worst gold healer and can be replaced even by a alissa pre AW. He can be used for farming male aff items tho.
Vincent is not that great either. He costs a bit too much and doesn't do enough IMO. monks , samurai and stuff like that is pretty bad at this rarity as well. Stray is pretty much useless preAW (actually i dunno if his aw makes him good enough to replace any of the plat archers either in any situation...)


Plat : samurais again... Maybe the crapload of other niche event units as well....like momiji or azami i guess.