Rathalos
Play Monster Hunter!
Swamp thing bashing you over the head wirh a tombstone makes less sense red hood with deathstroke moves.
Oh ya, Grundy does do that doesn't he, I always forget he has a super.
If they really wanted to go all out they could replace the tombstone with like a tree trunk, and the knives with vines, and change all his clash quotes to generic grunts. It would be kinda funny seeing him rip a tree trunk out of his stomach.
But I would rather just wait for Injustice 2, and hope he shows up in that.