Suggested by Sonic Gloomba is a pretty fun Mario villain even if he isn’t remembered too well at this point. Gloomba has heart, but that alone isn’t quite enough to defeat a dragon like Porunga. Porunga has never really had a chance to fight before, but thanks to his sheer size he could simply step on Gloomba and be done with it. At that point there isn’t anything that the little creature could do so it would be game over. Porunga wins.