We are WDW veterans and didn't see nearly as many characters at DL. My kids are way more into the movies now, and I was a little disappointed that they didn't get to meet their favorite stars. But we did meet:
Kenai and Koda at CA
Elastigirl and Donald Duck at the Backlot at CA
we saw Sorcerer Mickey at the Backlot at CA
we saw Pocahontas walking through DL
we saw Aladdin and Jasmine walking hand in hand through DL. Funny story: I called my DD by name and pointed out Aladdin and Jasmine, who both waved at her. We followed them to the Aladdin and Jasmine storytelling area, which is where they stopped. We were the first ones there, and I asked if we could get a photo. They said sure, and Aladdin called my DD by name and asked her to come over. She was totally beside herself with joy that Aladdin knew her name (she didn't realize he remembered it from me saying it while he was walking by). That was her most magical moment.
We saw Cruella DeVille on Main Street in DL
We saw Alice, the Mad Hatter, and the Queen playing charades in Fantasyland. This was a highlight for all of us.
We saw Mary Poppins and Bert on Main Street. They were leaving as we approached them, but took my DD by the hand and walked with us over to an area near their exit door. They signed her book and posed for photos. Very cool.
We saw Mickey and Minnie on Main Street in DL
We went to a lot of character meals and that is where we saw most characters. Unfortunately there were a lot of repeats.
We probably saw more but those are all I can recall at the moment. The characters are a highlight for us, so it was a little sad that we didn't see more. But you will see plenty in the parades, so that's nice.