The trio then welcomed Sink’s new costars to the stage:

• Kit Connor as Scott Summers,
• Christopher Abbott as Professor Charles Xavier,
• Samara Weaving as Emma Frost,
• Inde Navarrette as Rogue, and
• Maya Boyd as Storm.

Finally, Adam Driver crashed the panel with one final video surprise, where he revealed that he will be playing a very sinister figure named Nathaniel Milbury. (Mister Sinister)

I think all of these would work. Samara would not have been top of mind for the kind of role Emma is, but Marvel tends to do great on casting.

Shout out to Sarah Halley Finn who has been the MCU casting director since the beginning. It's one of those hidden roles that she continues to nail year after year.