My DS (10) has never liked characters. When we stopped for the character bus in Epcot last summer, he went and stood in a corner as far away as he could get without actually leaving us. So I worried about the character meal I had planned at the Garden Grill. (I was surprising my DH with the Rehitching ceremony for our 25th.)
At the meal, my DS was studiously ignoring the characters while trying to eat. Finally C/D comes up, assesses the situation, then proceeds to SIT on my son! My son looks at me and rolls his eyes. The rest of us burst out laughing. Soon, as C/D continues sitting, my son joins in the laughter (who wouldn't, with a big chipmunk rear in your face!!), and starts to interact with the characters!
After that, every time C/D walked by, he either sat on my son again, or pretended he was going to! My son loved it!!