Clea

Clea is an extremely interesting character who is an essential supporting character in the mythos of Doctor Strange. While she hasn’t been officially cast in the 2016 Strange movie, there are a number of actresseses – Rachel McAdams and Amy Landecker, for example – whose roles in the movie are yet to be revealed.

She is actually the niece of one of Strange’s most deadly foes – Dormammu – but she went on to become Strange’s lover and disciple.

She could be a powerful ally to Benedict Cumberbatch’s version of the character and the fact that her inclusion would virtually guarantee the future appearance of the incredibly powerful aforementioned Dormammu makes her appearance in the Marvel Cinematic Universe very exciting.