"So admit it..... Don't I look cool in the game screens? Those long, muscular legs on my sturdy toned frame.... I'm the perfect specimen of a man ..... What!?!? You say I look fat and my quadruple chin looks like a waterfall of flab? Shut up! That's just because you have your television set up on widescreen display!" - Wario (Wario World)
"Should've been called WARIO Golf! Still, you gonna love it!" - Wario (Mario Golf)
"I pounded down a healthy cup of sugar (with just a dash of coffee) for breakfast." - Wario (Warioware Mega Micro Games)
"
H-H-H-HURRY UP!!!" - Wario (Wario Land 4)
"It's-a Wii! Wario!" - Wario (Warioware: Smooth Moves)
"Behold the TELMET! Television! Teleportin'! And, uh, it's a helmet." - Wario (Wario: Master of Disguise)
Basically anything Wario, really.
Also this is a great one from Kid Icarus Uprising. Not exactly a quote, but still.
Pit: "Yeah, I know, I used them in the last brawl."
Palutina: "Brawl?! How horrible! Are you hurt?"
Pit: "No way! It was a SMASH!"
Palutina: "I just can't imagine YOU in a Melee!"
Pit: "...That's because I wasn't"
EDIT:
A recent one that I liked:
"I think it's time for Jack...to let'er rip!" - Raiden (Metal Gear Rising)