Inspector Gadget:
Sonic=Inspector Gadget
Amy Rose=Penny
Muttski=Brain
Sally=Brenda 
Uncle Chuck=her father
Robotnik=Dr. Claw
Snively=The scientist who works for Claw 
Grounder=Sykes
Geoffrey St. John=Officer Quimby
Larla-Le=The Mayor 
Anti-Sonic=RoboGadget
Anti-Sally=RoboBarbra
Vector=The Gadgetmobile(okay, he can do the voice)

Maric