For writing style, primarily J.K. Rowling and K.A. Applegate, considering Harry Potter and Animorphs are some of my favorite books. Also Paul van Loon, though people who aren't Dutch or Flemish likely won't know him. He writes children's books, and one of his main series (De Griezelbus) has a writer as the main antagonist, and writing and telling stories is a very central theme of the series. Some of the stories were also scary enough that they still make me shiver, which very few horror stories can do anymore. I also take a lot of inspiration from Tolkien's world-building and linguistics, though obviously I'm nowhere near his level in either of those things.
Beyond that, I take inspiration from just about everything I like in some way, so that would take too long to list.