I vote Kirby. He's light, has one the best jumps (it used to be the best), and is very strong. Also, if you corner someone just right, you can hold a and the oppenent can't move, so you can get their damage to 999% for an easy kill. Also he can use suicide moves if desperate...

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Brawl FC: 5455-9134-5090 Nickname: Kirby

"There's no use killing a dead horse."
"I think you mean 'beating' a dead horse."
"Why would someone BEAT a dead horse?"
"Why would someone kill adead horse?"
"Maybe it kicked you when it was alive."
"But it's dead!"
"And so is every customer who bought our flagship product."