Favorite children's book

Popping over to cheerpeppers for the promptosaur to fulfill this fun November challenge, prompt chosen was "Write about a childhood book series and how they influenced you."

A childhood favorite of mine was Harriet the Spy by Louise Fitzhugh.
 
I see there is a current movie from the book, but I haven't seen it.

I created a journal like Harriet (and still have it - amazing I haven't lost it in all of my moves). Harriet is an outlier and most kids can identify with that.

What book series influenced you?