There's no one out of the ordinary greeting on a regular basis right now. Toontown, Buena Vista Street and Town Square are all Mickey and friends, princesses meet at main gate, Fantasy Faire and the wishing well. Anna, Elsa, Merida, Tinker Bell, Pooh & co. all have dedicated locations. Storm troopers roam Tomorrowland occasionally. Tiana meets in New Orleans Square. Mary Poppins and Bert, Alice, Hatter and Peter Pan hang around the Hub/Fantasyland. Jake, Sofia and the Incredibles hang in Hollywoodland, Russell and Dug in Redwood Creek. Toy Story characters at the pier. Minnie in Condor Flats, Lightning/Mater in Cars Land. I'm sure I've left some out, but that's the bulk of it.