MARX in Kirby Superstar. I used to smack his ass around with ease, just for fu because even though he was the last boss he was pretty pathetic. He looked cool though, but really, really easy. Not once in my life have I seen such an easy attack pattern.
Meta Knight from Kirby Superstar was easy and awesome too. I would play the entire game just to be able to fight Meta Knight, just ebcause he's the COOLEST NINTENDO ENEMY EVAR!
Bad Ass from Duke Nukem 3D. Because I used godmode.
