I'm going to surprise everyone and say... Smash Ball from SSBB. If I could punch a shiny ball a few times and then use some sort of MEGA LASER, it wouldn't matter what you did because you and your bullets would be incinerated before you could fire.
Or the baseball bat (also from SSBB). Just hit someone and you get an instakill. That would be awesome, especially because everyone would think you were mentally unstable until you hit someone. Oh yeah, and the baseball bat is bulletproof, nukeproof, laserproof, fireproof, etc. So I could just hit your bullets away, Jedi-style.
