Rob Paulson was not only the voice of Pinky from Pinky and the Brain, but has done countless other voices:
Lilo & Stitch Series - Experiment #625
Final Fantasy X-2 - Tobli/Lian Ronso
"Tick, The" (1994) - Arthur
"Mask, The" (1995) TV Series - Stanley Ipkiss
"Sonic the Hedgehog"- Antoine
"Animaniacs" - Yakko Warner
Bubsy - cartoon and game
"Goof Troop" (1992) - Peter 'P.J.' Pete, Jr.
"Darkwing Duck" (1991) - Steelbeak
"Teenage Mutant Ninja Turtles" - Raphael
He also did one-off voices in Batman, Spider-Man, Quack Pack, Freakazoid, Fairly Odd-Parents and Kim possible
Jim Cummings does the voice of Winnie the Pooh, but also did the voice of Robotnik from the Sonic SatAM Series, Fuzzy Lumpings from PPG, Fat Cat from Chip & Dale, DarkWing Duck, Bonkers, Pete from Goof Troop, Psy-Crow from EarthWorm Jim, Cat from CatDog, and a whole load of others.
Kath Soucie did the voices for:
Ratchet and Clank: Going Commando - Angela
Rugrats - Phil/Lil/Betty DeVille
Final Fantasy X-2 - Taro
"Futurama" (1999) - Cubert J. Farnsworth/Michelle/Albert/Additional Voices
Space Jam - Lola Bunny
\"Quack Pack" - Daisy Duck
"Earthworm Jim" - Princess What's-Her-Name
Dexter's Laboratory - Dexter's Mom
"Sonic the Hedgehog" (1993) - Princess Sally Acorn/Nicole, Sally's Computer
"Tiny Toon Adventures" - Fifi Le Fume/Little Sneezer
"Captain Planet and the Planeteers" -. Linka
Soooo many people you can find doing other voices.