I can't see it being a non-Byrne character personally. Talisman at a push.
Part of me wants to say Sas, but after CW:AF I think that'd be a bit much.
The mention of Northstar's terrorist past makes me think he'll be very anti-government so it won't be him.
The way FVL's mentioned fleshing out Guardian's character a lot more, so that could go either way as either a very pro-government character or as a great leader.

In short... I'm still torn.