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Sylph, I think it would be good if he knew the nickname, and then he could draw the appropriate conclusions about the role.
Gargantua could be given more defense, or perhaps one ability that makes him invulnerable to everything; I'm not sure. He is a powerful unit after all.
The Paladin definitely needs an ability to ignore temptations and petrification effects, if I understand correctly how the latter works.
Regarding the Warlock, the crippling effect that reduces damage could be implemented without a cooldown in three turns. The curse could be replaced with an analogue of poisoning, but without leaving traces, and the purpose of the resurrection is unclear, especially since the resurrected unit can't even post in the thread.