Mike Sorrentino was a minor character who appeared briefly in the Season Fourteen episode, "It's a Jersey Thing". He was seen tied to a chair right before the Jerseyites started advancing upon South Park. Randy Marsh interrogated him. When he replied, "It's a Jersey thing", Randy starts beating him up, asking what he means.
He wears a white shirt, a tan vest emblazoned with a decorative "S" near the right shoulder, a belt with a buckle bearing the letters "TS", and blue jeans.
He seems to be unintelligent, to the point of not being able to explain what "It's a Jersey thing" means, although several other Jerseyites were the same way, so it is likely that he is of average intelligence among the other Jerseyites.