Raiko is 30% damage cut.Athena is fine if he only runs Thunder against Water.
Tyr, now that her rework is here, isn't bad at all either. Probably not MT worthy though.
Was Raiko nerfed at some point? I've had her since forever and could of sworn it was 45%, hmm, shame if true.
Baal/Tyr/Raiko are the ones that allow you to keep up with Shingen.
Marduk & Justitia both fill their burst gauge but that isn't consistent enough IMO