I first did a little brainstorm, it was fun to revisit some favorites. Most of these I still love today.
I'm not sure there is much of a visual thread here, but I think there are some recurring themes. Adventure, magic, hidden worlds, mischievousness, and comedy come to mind. Also characters that have a strong sense of what's right, and fight against unfairness.
I would be interested in hearing your thoughts, can you spot anything else?