Mine is either Green Goblin's Gobby or Norman Osborn. Either straight up direct damage or 2 free sidekick dice, Norman feels a lot like Magic the Gathering's Garruk Wildspeaker card, cost 4 but can free up to 2 resources.
For flavor I really love Spider-Man The Amazing. His flavor is incredibly accurate, the art is from AvX issue 9, the same issue where Petey valiantly and selflessly fought the Rasputin Phoenix siblings so his Avengers pals can rescue their captured comrades. He was savagely outpowered but through his clever, carefully chosen words, along with his trademarked sense of humor, jokes, wit, willpower and provocation, he managed to get Piotr and Illyana beat each other to a pulp. Halving the Phoenix 4 into the Phoenix 2 (Cykes and Emma) - halving the player's life force.