The shoulder muscles indicate that it ain't 100% fat that's making him big. He's got some swol with his thicc.
Our boy here is preparing to be a sumo wrestler.

Could also be a professional weight lifter. I remembering hearing a body similar to someone like Wario is more common in weight lifting because all that fat helps in some way (though I admit to forgetting if it's because the fat prevents you from literally busting a gut when lifting, or if it's because fat is needed as fuel).