We also saw the White Rabbit at the Plaza Inn, as well as Foulfellow from Pinocchio.
At Goofys we always see Goofy, Pluto, Chip & Dale. We've also seen Minnie, Jasmine, Mulan, Baloo, Gepetto, Aladdin, Belle in her blue dress, Sleeping Beauty and Alice. I think I am missing someone, but can't remember who for the life of me now.
The fairies meet and greet has Iridessa, Silvermist, Rosetta and Fawn besides Tink. Occasionally Vidia is with Tink, but I am not sure if this is still ongoing. Terence is a possibility, but according to a CM I spoke to in November he'll only be there if one of the other fairies can't make it. He is not on the usual schedule. Rosetta is rarely out too, she was only scheduled for one day of my 2 weeks trip in fall.
Daisy is only at the Surf's Up Breakfast in Paradise Pier, I have never heard of her being out in the parks unless it was fo a parade.
Unless I missed a major change Maleficent was only out for Halloweentime and only during the parties. Sometimes the Evil Queen from Snow White is out though.
Mickey, Minnie, Pluto, Goofy and Chip and Dale are out very often, mostly in Town Square. In November we regularly saw Gepetto and Pinocchio there too, and also Mary Poppins and Bert as well as Cruella DeVille. One morning even had the White Rabbit with the Queen of Hearts!
Donald is not in Town Square that often per my experience, Toontown would be your better bet for him.
We saw Goofy's son Max, Aurora, Mulan, Pocahontas, the Evil Queen and Chip and Dale near Animation Academy in DCA, but not sure how this is going right now with the construction.
We've bumped into Brer Bear and Brer Fox near Splash Mountain, but that was three years ago. Also Stitch was in DCA near the entrance, but of course with the construction that'll not work anymore either. (Just trying to cover all possibilities there.

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Like TheColtonsMom has said, it's really hard to tell who you may meet.
I've been going for Halloweentime since 2006 and 2010 was the first year I met The White Rabbit. Local friends of mine are there basically every weekend and never met him.