Ruki is such a fun muse to have. He can pretty much be turned into anything. I used to have him as a spy back in the day. Never made him fully insane though - that was always Wataru - so this should be fun.
And ohh, the General Shop Owner would be great. Is he going to be a really straight laced good guy? If so, Jack will love stealing from him. If he's a bit dodgy then it might be possible to have him and Jack as an odd team. Jack steals, your guy sells.
Haakon is amazing. Makes me almost want to have a fae just to stalk him. Having said that, I'd love to have him and Jack meet eventually. That's bound to go horribly. LOL.
Pike... grah. He's just so fun to annoy. Jack loves it. I think it's going to become his new favourite bored past time.