What's in the box? Your suggestions!

This is the suggestion box for d-VOR-ak's book 5. What is d-VOR-ak, you ask? It's a weekly string theory serial, something akin to Doctor Who meets Scooby Doo, following the collision and separation of worlds and the kids in charge of it all. The series updates weekly and relies heavily on user suggestion. That's where you come in!

We're coming back with book 5 in the series, which will start posting next year in 2019. The book will be written at the end of this year for NaNoWriMo.

Rules:
-- You are allowed to submit whatever you want to the box.
-- There are obviously a few caveats to this. Illegal suggestions, specific character suggestions that are OOC, and suggestions not appropriate for a young adult audience will not be considered. Other than that, we're pretty fair game.
-- The box will be open until October 15th. This will give the author time to compile the responses and draft them into the book.