I would say Astra needs a a 5 star again and a slight decrease in the ability timer.
Yoru needs a faster TP
Cypher needs everything he can get
Sage needs an slight wall buff
Omen also needs a faster tp
Phoenix needs to be able to cancel his ult and stay in place rather than teleport back
Not a mini buff, rather a large one, but now phoenix is the only agent that cannot cancel his own ult easily (apart from the ones that go automatic like fade/breach/skye) and actually is disadvantaged by his ult at times