I've seen Flick and Atta on the dance floor, and also Clarabelle.
There were 7 photo stops:
two princess ones - one with Mulan & Ariel and Jasmine and I think Cinderella switching (near Ariel's Grotto) and a second one near the Hyperion theatre with Pocahontas & Belle and Snow White and Sleeping Beauty.
One with Playhouse Disney characters (which I didn't stop for, so unfortunately no details there), near the actual Playhouse Disney show building. I think I saw Handy Manny once when passing, but that may have been my imagination.
Toy Story characters, near TSMM ride. When I was in line Bo Peep switched with Woody. Seems the Little Green Men are always there.
Villains - last year near the Golden Dreams (screams) theatre. I'm guessing this one will be moved this year. The Evil Queen was alternating with Lady Tremaine and her daughters.
Mickey & Minnie: near the bridge to Paradise Pier. This one had by far the longest line when I was there last year. It was just the two there, and when they were on a break Cruella and/or Queen of Hearts seemed to come over to keep the crowd busy.
Pirates: on Paradise Pier, near the picture spot with the net full of fish. Jack Sparrow was there, and the second group was Hook with Peter Pan and Wendy. Sometimes Hook would appear solo though.