That sounds like a plan, would you want any Character Sheets or should we just go off what we know, not needing to outline canons? And in terms of starting points, we'll need to figure out what could glue Tony + Pepper together as well as Charles + Raven, as she did side with Erik. (oh Erik and Raven <3) 

Did we want Raven to go back with Charles acting as a spy for Erik or would we want her going back on her own accord, hopefully trying to resolve things? We should also take in mind that the time is very different for each film so we may need to magically move First Class events into the present where Avengers left off...?

And with Pepper and Tony, did we want them relocating to NYC or would we want them going back and forth between there and LA? Is their relationship public, let alone official?