As for the UN Ban thing, I have no preference. Lift it. Destroy it. Don't. It never gives me pause, one way or another.
As for who to bring over, my suggestions: Griss, Phil, Grimm, Bri, Drake, Adem, Tommy, and Gaunt.
Ozzy's expertise ends at boxing. So, unless you need someone to have the crap kicked out of, there would be no point in bringing Baxter. And, honestly, I don't know Tiberius enough yet to want him involved. And Ian's a secondary character. So, it's not important if any of my characters are represented.
