Books where the side characters and friends of the protagonist really steal the show and make it a better book as a result. Whether it's the classic archetype of the funny but deep best friend or the comforting parent, sometimes these characters make the book that much better. These characters could also include teachers of the protagonist, mentors, teammates, or boyfriends/girlfriends. This is a list to appreciate those characters who are often overlooked but have such a great and profound impact on the book.