Difficult question. I recently passed N4, and still have a hard time with kids shows like Doramon or chibimaruko-san. They use lots of kid words, which are not in N4/n5. Plus, Doraemon talks FAST, which is simple for Japanese kids, but really tough for second language learners.
My kids used to watch Shima-Jiro and Anpan man which are directed to a preschool audience, and the language is pretty simple. The problem is, I can’t imagine an adult being terribly entertained by the shows.

