Maximus

Maximus – or Maximus the Mad as he is sometimes known – is the brother of the Inhuman leader Black Bolt. He has become the classic villain of the Inhumans in the comic books and it would be, as such, not at all surprising to see him as the villain in the movie.

The main thing he has going against him is that Marvel Studios have already done the “brother rivalry” thing with Thor and Loki, so they might want to step away from that kind of plot in future movies.

He was essentially jealous of his brother being on the throne and vowed to usurp him – which, again, highlights glaring similarities between his situation and that of the Asgardians.

That being said, Maximus is a great character who could be a threat on a number of levels. The power he spawned through Terrigenesis was mind-based, in the sense that he can manipulate and alter people’s minds in various ways (mind-control, mind-swapping, invoking amnesia etc), but he is also a bona fide genius, capable of inventive schemes and the creation of high-tech weaponry.

He first appeared in 1966 in Fantastic Four #47 and, in spite of the brotherly similarities to the aformentioned Thor and Loki, would indeed be a great movie antagonist.