My best book friends (real or made up).
This was a really difficult one. But I will go for real friends. My wifey Kayla and my mistress Bella (ha ha ha) are both friends that have become best friends through our common interest in books.
When it comes to books I would say that the HP characters are “best friends”. Why? Because they are books that I come back to many times and still love. It feels like coming home.