Well I will tell you who I've seen and what I know because everyone has seen the same character/s in different locations.
Mickey - (DL) Main Street, Toontown, Parade (DCA) Hollywood backlot
Sunwheel
Minnie - (DL) Main Street, Toontown, parade, Hollywood backlot
Sunwheel
Pluto - (DL) Main Street, Toontown, (DCA) Hollywood backlot, (DLH) Goofys Kitchen
Sunwheel
Goofy - (DL) Main Street, Toontown, (DCA) Hollywood Backlot, (DLH)Goofys kitchen
Sunwheel
Max - (DCA) Hollywood Backlot
Jack Sparrow - (DL) New Pirates layer island,
Pirates of the Caribbean (Though Pirate's Lair was closed for the day and he got MOBBED)
Hercules - (DCA) Hollywood Backlot *NOTE HE IS SEASONAL OCTOBERISH*
Woody & Jesse - (DL) Frontierland (DCA) Hollywood Backlot
Mater/Lightning Mcqueen - (DCA) Condor Flats across from Soarin over Cali
Mad Hatter & Alice in Wonderland (DL) Main Street, fantasyland, Parade (DLH) Goofy Kitchen
Plaza Pavillion, Coke Corner
Fairy God Mother (DL) Fantasyland, Parade, Main Street (DCA) Hollywood backlot
Aladdin (DL) Aladdin's Oasis, Parade of dreams (DCA) Hollywood backlots Aladdin Musical (DLH) Goofy's Kitchen
Tweedle Dee/Dum (DL) Main Street beside Coke corner, usually found playing musical chairs with Alice and the Hatter as well as Mary Poppins & Bert
Marry Poppins & Burt (DL) Main Street and Fantasyland,
Plaza Pavillion, Coke Corner
Cruella Duville (DL) Main Street
Chip and Dale (DL) Main Street & Toontown
Stitch (DLH) Goofys Kitchen
Sunwheel
Captain Hook (DCA) Golden Screams by Paradise Pier
Coke Corner
7 Dwarves (DL) Parade of dreams (DCA) Electrical parade
Queen of Hearts (DL) Main Street & Parade of dreams
Winnie the Pooh (DL) Critter Country by the Pooh Ride, Parade of Dreams
Eeyore (DL) Critter country by Pooh Ride & Parade of Dreams
Main Street
Tigger (DL) Critter Country by Pooh Ride & Parade of Dreams
The Princesses (Ariel, Cinderella, Aurora, Snow White, Jasmine, Mulan)
You can find these girls in several different places: (DL) Fantasyland at the Princess fantasy fair, the parade of dreams. *Apparently they dont do meet and greets by the castle any more

but as for Ariel I dont know if she still comes out of her shell as she cant exactly walk in the Princess Fantasy Fair.
In DCA you can meet them at Ariels Grotto for Breakfast/Lunch/Dinner but be forwarned that Ariel is a HUMAN and in a dress so that can shock some little kids.
Disneyland Hotel at Goofy's Kitchen I saw Belle but she wasnt in the yellow gown, she was wearing her blue dress.
Jasmine is also in Aladdins Oasis