I started writing the first book in The Fantasy Reject League, a YA Fantasy trilogy (series?), a few weeks ago after someone offered to sponsor me with a cover, editing, and marketing. The first thing the main character demanded was a first person present POV.
Characters must be believable or they sour the story. Hardcore expectations come into play when it's a human or animal, If something is going to be changed about them, it needs to be done carefully or the character going to appear fake or corny. I draw on my experience with horses to make these changes.
During them, I learned about her history of undercover operations. I still don't know the details of every one, but I now at least know how and why Jo does things, both as herself and other people. It also triggers the need for me to write a twenty-sixth book in the core series.