My grandson never asked about the characters, I guess he always knew there was someone inside those costumes.
A funny story. Growing up he loves the Tomorrowland Speedway. We would spend hours in line, thought he was really driving these cars around the speedway. DH and I would roll our eyes, again and again we would have to wait in at least an hours line so he could drive these cars.
On the spring of his 8th Birthday he grew up. He looked down "hey I'm not driving these cars, there's a track". My heart broke that day. He still likes this ride, but not with the same enthusiasm.
I hear people say my child is too young for Disney, how wrong they are. Where would you ever get the innocence, excitement and pleasure of seeing a child who believes.
It's one of the most rewarding pleasures of being a parent or grandparent, and seeing the twinkle in their eye. A twinkle the only Disney could put there.