Jeff comes from Earthbound as a new playable character. He uses gadgets instead of PK power, and he was an assist trophy in Brawl.
B. Multi Bottle-Rocket: His assist function toned down a little.
B. Bazooka: Jeff fires his bazooka at foes.
B ^ Big Bottle Rocket: You get the idea.
B V HP-Suckers: Jeff uses these to damage foes and reduce his percentage meter.
Final Smash: Death Ray