It would be awesome to swap bodies with video game characters. There's a lot of characters in my list, but I'll keep it short and simple.
Captain Falcon: It would be great to be fit, drive around in the Blue Falcon, and Falcon Punch jerks in the face and watch them fly into the sky, though I wonder how he will do when he can't Falcon Punch people.
Bowser: I'd rule over all of the Koopas and be able to breathe fire, but I can't be a parent: I'm not in a relationship.
King K. Rool: It would be a DREAM to switch bodies with this kroc! Big crown, beautiful cape, awesome scales, and a army of Kremlings would be awesome! I could also be a pirate, and taking bananas would be fun ("My bananas, Donkey Kong!"). However, I wonder what King K. Rool would do in my body once he realizes his army is gone. He'd just be stuck in college.