Magic Kingdom
In ToonTown you can find Mickey in the Judges Tent.
In the County Bounty Tent, things vary slightly on a daily basis, but you can usually find:
Daisy
Donald
Minnie
Goofy
Pluto
Chip & Dale
Snow White
Cinderella
Belle
Aurora
and surprises now and again.
Ariel is in her grotto
Jasmine, Aladdin & Genie are in Agrabah
Alice & Mad Hatter some mornings by the Tea Cups, but sometimes it is the Rabbit and the Queen of Hearts or varying combinations.
Stitch is in Tomorrowland and sometimes Buzz is as well, but not together.
Hook & Smee are in Adventureland across from Pirates.
Peter Pan and Wendy are near the bathrooms by Pirates.
Epcot
Character Spot has, usually, Mickey, Minnie, Goofy, Pluto, Chip & Dale
Figment at Imagination
Donald & Caballeros in Mexico
Snow White & Dopey in Germany
Mulan in China
Aladdin, Jasmine, & Genie in Morocco
Belle, Beast, Aurora, Marie in France
Pooh, Tigger, Eyeore in UK
I'll give you the rest of the parks tomorrow...must get to work.