With recent reports that Marvel Studios and Sony have struck a deal for Spider-Man to appear in Captain America: Civil War, is there a chance for some other characters with a diverse history to join the MCU?
As a long time Spidey fan, the Marvel Team Ups got Peter Parker involved with so many other characters, one of which was Captain Britain. In Marvel Team Up #65, Brian Braddock's firsts outing in the USA, he lands up in America at Empire State University as an exchange student and becomes roommates with Peter Parker and both ultimately battle Arcade.
We've already seen a few established characters from the UK appear, the most notable being James Falsworth in Captain America: The First Avenger and a different Lance Hunter in Agents of S.H.I.E.L.D., and we've seen an iconic area of London being decimated in Thor: The Dark World. So, how can Marvel expand their shores to the UK fully with our wonderfully stereotypical analogue of the British Isles, Captain Britain?
Let's look at the forerunners:
With the Ultimate version of S.T.RI.K.E. being adapted to being the S.H.I.E.L.D. Assault Group and Lance Hunter's backstory being changed and interlinked with S.H.I.E.L.D. that leaves us with MI13.
MI13, or the Extraordinary Intelligence, for the purpose of the entry into the MCU could be the British allies that Phil Coulson went to visit. Maybe during his visit he learns out more about Hunter. Possibly set up in the aftermath of the Cold War and kept relatively unknown until the events of Cap 2, EIS could appear in Phase 3 in Captain America: Civil War. Characters related to X-Men would, of course, not be involved but there's so many that could make up the first team. Dane Whitman, Blade, Joseph Chapman and Kelsey Leigh could all appear alongside the daughter of the original Union Jack, Jacqueline Crichton.
Similarly the S.H.I.E.L.D.'s Super Soldier Program that includes Andrew Black, Alec Dalton and Joseph Hauer could be adapted into EIS using Darkmoor Research Centre and being collaboration with Stark. This would be a suitable avenue for Brian Braddock as a doctor of physics to be introduced as project lead.
Thor, Dr. Strange and Inhumans
Straight out of Thor: The Dark World, Eric Selveig is seen lecturing fellow inmates. In his writings, Selveig makes reference to Dr. Strange and the Inhumans which unusually share links with Brian Braddock. Strange and Braddock have both been members of the Illuminati in Earth-616 and Braddock has also taken care of Black Bolt's son, Ahura Boltagon, in Earth-9997.
This might be out there, but could Captain Britain's origin be similar to that of a certain Skye/Daisy Johnson? And will Dr. Strange help him understand his magical based powers? This could be central to a larger storyline in Phase 3 with Avengers: Infinity War looming.
Could Braddock be the secret weapon of the Avengers?
Braddock Picks Up the S.H.I.E.L.D.
With rumors that Bucky the Winter Soldier will at some point replace Rogers as Captain America, Braddock might do what Kelsey Leigh did and save Rogers. This would put a spin on Cap 2 and the original origin story.
Personally I'd stick with Merlin, but the Myrradin of Ruta wizard, appearing to Braddock... but with him picking up the shield, he would automatically be given the Amulet of Right. Maybe joining the previous two rumor-mill suggestions, the Quarterstaff is of Asgardian origin and his suit is designed by Stark/Rogers. Maybe even a handshake from Rogers acknowledging Braddock's contribution to global security.