Who knows you best, Baby?
When you write a book, and most especially a series of books, you get to know your characters almost like you know yourself. They come alive and (unbidden as many times as bidden) will sit on your shoulder or walk along beside you while they tell you their stories, or they will visit your dreams, guiding you to a better, but mostly subconscious understanding of their world. Through these interactions with them, you learn their fears, their joys, their triumphs. The pretty, th