3. Ikari Warriors
Inspired by Rambo the Ikari Warriors made their first appearance in 1986 and featured on a vast number of systems at the time ranging from Commodore 64 to Atari 2600. I remember playing this game on my ZX Spectrum and found the vertically scrolling 'shoot everything in your path' approach much fun as a little kid. Being the soldiers they are a number of weapons and attacks would be available if they made the jump to the Super Smash Bros series. A variety of guns (they only had one in the original game) could be added and their traditional grenade attack would make short work of enemies. If the developers wanted to push the boat out they could allow Colonel Ralf and Second Lieutenant Clark to commandeer tanks and such just like they could do back in the original game.