Are you able to change once it hits 10? It's fine if it's not.

As for my new bet, it was difficult deciding between Tarquin and Geoff.

I go with Uncle Geoff. Simply because he has to come back to the story with Ian and Tarquin soon because book 5 is about family. Of these 3 characters he has the shortest life span as he has no room for character development and is not a "side". Also he's hiding something.