Blob

The Blob began as a large mutant who was almost immovable. His size gradually increased over the years, growing from the height of a normal man to a towering giant. When Onslaught augmented the Blob's powers, he got even bigger. After M-Day, the Blob lost his powers and shrunk to the size and weight of a normal man, though with a huge quantity of excess skin. Since then he has lost the excess skin and has become a weight loss guru in Japan though he was also seen with the High Evolutionary and Magneto recently. (1)