I refer to myself as a little, but I guess the term middle would be more appropriate.
My little age is around 9-12. I have no interest in pacifiers, sippy cups, plush toys or the like. I do like video games, toy cars and soldiers, cartoons and playing outside. I am obviously old enough that I don't need to be fed, dressed or babied, and can look after myself to s certain extent. At the same time, I'm a DL, so to incorporate diapers into my little time needs some imagination.
When I'm little, I can be accident prone. In real life I had a few wet accidents around this age, and was a bed wetter as well, so I guess I like to recreate or reimagine stuff that either happened, or that I would like to happen.
Little me will get distracted by what he is doing, and may wet his pants. He may have a bladder problem that causes him to lose control occasionally. As a result, he may be diapered not as punishment, but because he needs protection sometimes.
My usual little protection is just the basic Depends briefs. When I'm playing as a little, these become a pull up to me. If I do have real diapers, they are worn because little me wets the bed, and I may pretend I'm diapered from the night before, or my bed time is approaching, or I'm going on a long car ride.
So basically I like being a big kid, I don't want to be babied, but I like wearing a nappy or having an accident in my pants sometimes.