Here is who I would cast for uncasted Marvel Cinematic Universe Characters.
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Matt Smith as Reed Richards/ Mr Fantastic
I would like the MCU version of the Fantastic Four to be british, and modelled after Doctor Who. I think Matt Smith would be brilliant as Mr Fantastic
Georgia Moffett as Sue Storm/Invisible Woman
Bradley James as Johnny Storm/ Human Torch
Robert Kazinsky as Ben Grimm/ The Thing
Peter Capaldi as The Wizard/ Bentley Wittman
I think the Wizard should be the villain in the first MCU Fantastic Four Movie as he is involved with Medusa in the Inhumans.
James Nesbitt as Norman Osborn/ The Green Goblin
I think James Nesbitt would make a very good Green Goblin. Watch James Nesbitt as Jekyll in the 2007 BBC series of the same title and you will see why.
Steve Pemberton as Otto Octavius/ Dr Octopus
Gabriel Woolf as the voice of Dormammu
I think Gabriel Woolf would make a very good voice of Dormammu, Watch him as the voice of Satan in the Doctor Who episode Satan Pit and you will see why.
Hannah Spearritt as Carol Danvers/ Captain Marvel
I would love to see the Former S Clubber Hannah Spearitt as Captain Marvel.
Kara and Hannah Tointon as Medusa and Crystal
I think these real life actress siblings would do very well as Medusa (Kara Toinon) and Crystal (Hannah Tointon). Just put Kara in a long Red Wig she would be perfect as Medusa. Medusa will first appear in the MCU as a villain in the MCu Fantastic Four working with the Frightful Four
John Simm as Maximus the Mad