Since its inception in 2008, the MCU has been the cinematic home to almost every character from Marvel Comics, with a few notable exceptions.
Will the characters be reintroduced in new MCU versions?
With Disney now buying Fox that brings the X-Men and Fantastic Four libraries back under their control for the first time.
Before Marvel began making their own movies they licensed their characters to other studios; Sony got Spider-Man and Fox got the X-Men and Fantastic Four.