Re: New characters you want to see in the First Class sequel?
If they're able to create some explanation for it, then Scott, Jean, and Ororo would be great for the 70s team. If not, Polaris and Sunfire would be great as well. If the father-daughter connection between Erik and Lorna is maintained, it doesn't have to be dealt with in this film. Perhaps it could be hinted at, but it could be properly dealt with in a subsequent film.
We got biscuit!