Why Godfather? He should actually be a townie and who both sides. That leaves me to think he might be third party who can turn town depending on some events.
Wait I don't know Harry Potter guys so I'm a little confused about my character. Who is Tom Riddle???
This. It would be hard to think of any third parties bar the muggles at this point of the storyline but I haven't read the books in god knows how long