It's always hard to wrap up a series. The longer I spend with the characters, the more they become like friends.
I love Norse mythology - Thor and Odin and Loki - amazing characters.
You know what would help this boy?" Demeter mused. "Farming." Persephone rolled her eyes. "Mother-" "Six months behind a plow. Excellent character building.
I think kids want the same thing from a book that adults want - a fast-paced story, characters worth caring about, humor, surprises, and mystery. A good book always keeps you asking questions, and makes you keep turning pages so you can find out the answers.
All of my characters tend to be montages of different people I've met: little bits and pieces of their personalities put together.
Kids, if anything, are harder to write for because they are a more discerning audience. They will not stay with you if you go off on a tangent or if you give them extraneous information that doesn't serve the story. You really have to tell a tight story. You have to give them humor and suspense and believable characters. All those things that adults want too, but you have to be really on your game when you're writing for kids.