I'm looking for examples of books for ages 4 - 8 with naughty main characters. Not evil ones, just ones who go get into trouble, such as Curious George, or Harold and the Purple Crayon (even though he doesn't get into trouble, his parents couldn't have been too happy with him drawing on the wall).

Most of the examples I've thought of, such as those two (Curious George and Harold) are books that were written a while ago. I wonder whether editors no longer buy a book that they think might make a child more likely to misbehave.

What books can you think of for fairly young kids where the main character is mischievous?

Thanks in advance,