RHI! <3 I AGREE, WE DEFINITELY SHOULD THREAD! /super high five!
Gaah, I know - there's so many options, it's hard to choose! You had to pick my three favorite characters too! I'm dying to play Gemini, Ira, AND Salazar...
I haven't played as Ira yet at all, so having Ira chill with Cadmus and Sorin sounds like a wicked idea to me! I think having Ira and Sorin go on a mage hunting job would be hilariously good fun~ Ira hates magic but he pities magic users more than anything, and he'd probably go out of his way to be nice to their captured ward. Which would probably annoy / enrage? / confuse the hell out of Sorin xD
Gemini - he's my absolute favorite! He would definitely be in places where he could bump into commoners, since he's always gallivanting around town. xD Looking at your Serendipity characters - Dai and Gemini would probably be an interesting combo, hell, Kyran too! And he would probably get a kick out of Iris as well! Maaan, so many choices...
Salazar! I love him as well~! Man, Morgan and Sal would probably make for an interesting thread, I think - but Sal is pretty versatile when it comes to threading...
Crap, my post wasn't very helpful either, ehehehe... What do you want to do the most? Hell, we could do play with a little of everything, if you want!