I'd like a Sharp playbook, too. I was thinking along the line of Littlefinger, or maybe later-book Tyrion (Game of Thrones characters, for those who haven't read). Someone with their fingers in all the pies, a lot of high-stakes plays but the "power behind the throne" kinda vibe.
Maybe it's hard to have them get directly involved from the get-go, but I think it can happen.