What contestant on Last Comic Standing used his large size as part of act?

The contestant you are thinking of is Ralphie May. He was a stand-up comedian who used his large size as a significant part of his act. He often made jokes about his weight, his struggles with obesity, and the challenges of being a large person in a world designed for smaller individuals.

Ralphie May was a popular contestant on the second season of Last Comic Standing, where he finished in second place. He went on to have a successful career in stand-up comedy, appearing on numerous television shows and releasing several comedy specials.