We were at DLR last week, 2 days at DL and 1 at DCA. We saw a lot of characters without even trying. At DL, Mickey, Minnie, Goofy, Pluto, and one of the chipmunks could be seen on the Main Street train platform off and on throughout the day. We saw them as late as mid afternoon that I remember. We saw Woody on the upper level balcony of the Golden Horseshoe. Kylo Ren and Storm Troopers in Galaxy's Edge on a balcony performing. We saw one or two cavalcades down DL main street but we didn't hang out in that area much.
At DCA we saw Elsa and Anna, Oswald, and other characters at the circle at the end of Buena Vista Street. It seemed there were characters there frequently during the day. We also saw Lilo and Stitch, separately, about 30 min apart at the little stage in the eating area of Paradise Garden Grill. Mr. Incredible was on the pier near where the Incredicoaster launches about an hour after opening. Also saw Miguel from Cocoa and Spider Man.