Let's add everything together on Red here.
For five resources, you're getting a max of 8 damage if you swing him out and then trigger. Or, it's a max of 6 damage + a block. Or he's six thwart and two damage, or four thwart, two damage and a block.
Triggering him bounces him back to hand, so you functionally have a discount on his cost of one resource. He can be stashed on Bruno Carrelli or pre-staged with Aamir Khan.
Those little iterative instances of two damage really add up over the course of the game, and Red's a pretty balanced effective addition with interesting lines of play, much like his friend Kamala Khan.