Here is who I will cast for characters of the Marvel Cinematic Universe.
Gabriel Woolf as the Voice of Dormammu- Gabriel Woolf voiced Satan in the Doctor Who episode the Satan Pit, Because of his sinister voice, I think Gabriel Woolf would make a very good Dormammu.
James Nesbitt as Norman Osborn/ The Green Goblin- I think James Nesbitt would be very good as the Green Goblin, Watch James Nesbitt as Jekyll in the 2007 BBC series of the same name and you will see why he should be the Green Goblin.
Steve Pemberton as Otto Octavius/ Doctor Octopus
Mark Gatiss as Curt Conners/ Lizard
Hannah Spearitt as Carol Danvers/ Captain Marvel
Matt Smith as Reed Richards/ Mr Fantastic- I think The MCU version of the Fantastic Four Should be British and Modeled after Doctor Who. The MCU Fantastic Four should make their first appearance in Marvels Black Panther movie. In the MCU This version of the Fantastic Four are Inhumans and the cosmic cloud that the Fantastic Four were exposed to is in fact a Terrigan mist.
Georgia Moffett as Sue Storm/ The Invisible Woman
Bradley James as Johnny Storm/ The Human Torch
Robert Kazinsky as Ben Grimm/ The Thing
Robert Llewelyn as Harvey Elder/ Moleman- Moleman will not be a big part in the first MCU Fantastic Four Movie but a small cameo in the first 5 minutes of the movie.
In the MCU, Bentley Wittman was once the CEO of Wizard Corporations, It was he who financed Reed Richards journey to the Terrigan cloud outside of Earth. After the accident that gave the Fantastic Four their superpowers, Bentley Wittman and his company was left bankrupt and was forced to sell his company to Stark Industries. He then turned to a life of crime. he unites Ulysses Klau (Andy Serkis) (Who the Fantastic Four and Black Panther defeated in the Black Panther movie) , the brainwashed Medusa (Kara Tointon) and Trapster to form the Frightful Four.
Marc Warren as Black Bolt
Kara Tointon as Medusa
Hannah Tointon as Crystal
John Simm as Maximus the Mad
Aiden Turner as Logan/ Wolverine- This Version of Wolverine will first appear in Avengers Infinity War Part 2.
Stephen Fry as Hank McCoy/ Beast
Freema Agyeman as Ororo Munroe
Anthony Head as Nathaniel Essex/ Mr Sinister
Derek Jacobi as Magneto