Thunderpunch is Lee Gruber, a member of the superhuman Neo-Knights. He has the power to energize his hands and feet making them powerful enough to go toe-to-toe with a Transformer. He is not the snappiest dresser, having spent the majority of his time on the superhero team wearing an outfit that made him look like a barefoot football player.
Marvel Comics Continuity
Lee Gruber was a freakshow star, also having had repeated run-ins with law enforcement. He was one of the first superhumans approached by G.B. Blackrock after the wealthy industrialist was given the authority to form a task force against the Decepticons. He accepted Blackrock's offer, but he had to shave a truly inspirational beard to join.
He and his fellow Neo-Knights would later engage Scorponok in a battle where the large-footed superhuman proved... less than effective.
- Hypothetically, since Thunderpunch never appeared in a non-Transformers publication, he should be fully owned by Hasbro. Good luck getting anyone to realize this, though.