The Thing, real name, Benjamin Grimm, was a friend of Reed Richards who was caught in the accident that created the Fantastic Four - while the others remained relatively human he was mutated into a rock-like monster and he is very sensitive about that fact - Reed has promised to find a cure for Ben but so far has been unsuccessful.
Despite the tragedy behind the Thing the man remains a hero - famous for his battle-cry of "It's Clobberin' Time!" and being the resident strongman of the team he is the one most likely tearing apart a Doom-Bot or holding up a bus to save some innocents, of course he has a softer side too, despite his appearance.
The Thing is super human strong and virtually immune to damage - able to fight against the Hulk for a while, he also tires slowly and can leap pretty far and high - probably due to his sheer size and strength. Also despite his rocky appearance the Thing retains the same agility and reflexes he had as an ordinary human and can catch unwary opponents off-guard, the Thing is also a highly trained pilot as he was a former test pilot in the United States Air Force and is equally well-trained in hand-to-hand combat with knowledge of boxing, wrestling, judo, jujutsu and street fighting techniques.
The Thing in 1978 Fantastic 4
The Thing in Fantastic 4 60s
The Thing in the Fantastic 4 animated series.
Thing in the Spider-Man animated series
Thing in Fantastic Four: World's Greatest Heroes
Thing in The Avengers: Earth's Mightiest Heroes
Thing in Hulk and the Agents of S.M.A.S.H.
Thing played by Michael Chiklis in the 2005 live-action movie Fantastic Four
Thing portrayed by Jamie Bell in the 2015 reboot Fantastic Four