Not sure if these were already posted, but what the hell:
Luigi: Go ahead-a, Bart, take-a the Bonestorm.
Mario: The store, she's so rich. She'll-a never notice.
Donkey Kong: Duh, it's the company's fault for making you want it so much.
Lee Carvello: Don't do it, son. How's that game going to help your putting?
Sonic: Just take it! Take it, take it, take it, take it, take it! TAKE IT!!
Buy me Bonestorm, or go to HELL (at least I think that's what it was)!!
Also, two of my all-time favorite random, made up characters: Ku Klux Clam and Professor Gas Can.