Fort Wilderness offers a variety of entertainment options, some of which include characters. For example in 2012 we went to Chip 'n' Dale's Camp Fire Sing-A-Long, where we were able to interact with the trouble making duo for an extended time as there was hardly anyone there!
It's best to check the schedule of events upon your arrival at the resort.
Disney's Fort Wilderness Resort and Campground offers traditional camping facilities and log cabins for those less willing to sleep in a trailer or tent!