Kirby - Ever wanted to see what Kirby's skeleton looks like? No? Well, too bad!

His skeleton must be made out of some kind of spongey material because that guy regularly squishes and stretches both in his official games and in the Smash Bros. franchise that's impossible for anything with a normal skeleton.

Even worse. those are not ribs. They are just attached to one of the upper vertebrae. Those are wings. Kirby has fleshy wings that he can choose to extend, should the trumpets be blown.