This is Sascha and I have a few bbs to sprinkle around the joint.
Howard Stark
Howard is coming in with MV history and he is, well, he's Howard. Don't hold that against him. (Unless you buy him a drink first :P.) He will eager to figure out his new environment and set up work and a place to live. It's a bigger town with more scope so he will be busy.
Charles Xavier
He also has MV history and he won't enjoy the big city quite as much but a larger college to work at and a park nearby will help him adjust. He will be less concerned about finding the cause of the dome and more with making sure there is peace among the arrivals.
Castiel
He is coming in from MV too and he will be hoping to see some friends. He doesn't like big changes so he might be a bit out of sorts till he finds his feet.
and, finally, a new muse.
Mycroft Holmes (BBC Sherlock)
The horrid older brother of Sherlock. He's the British Government so they'll probably miss him. He doesn't really like anyone but he does appreciate certain things. Especially cake and reason. He's snooty and prickly but, every now and then, he might step in to bat for you. By chance.