I really liked the sorcery system with the colorful umbrellas and everything. And it's kind of amusing that whenever a sorcerer got a promotion their entire desk space moved up however many floors and all the sad saps who didn't make it threw stuff at them because they were so jealous.
The way this part of the Will was hidden was kind of genius. I think it's also my favorite part out of all seven. He's more understanding and likable overall. Plus, he doesn't mind turning himself into whatever fits the situation which makes him a heck of a lot more humble than the other pieces (especially when put together).
Arthur has now accepted his fate to become a Denizen, the rightful heir through and through. However, it starts to eat away at him a little at a time. He finds himself prone to anger and self-righteousness and often sees the similarities between him and Dame Primus. He does his dead best to fight it, though, and that's what makes him a truly amazing character.