Avengers: Endgame - 11 New Heroes It Could Introduce
9. MI-13
Spinning off from Black Knight is MI-13, the UK's metahuman intelligence service that features the likes of Captain Britain, Black Knight and even Blade among its ranks. It's also possible that Marvel could be toying with the idea of including Excalibur - the UK equivalent of the X-Men - but until the Disney-Fox deal is wrapped up properly, MI-13 is probably the safer bet.
A while ago, it was actually rumoured that Marvel were looking at Guy Ritchie to helm a Captain Britain film, which would've featured the aforementioned Black Knight in a supporting role. While those rumours were just that - rumours - they have persisted, to the point where some even believe that Captain Britain could make a cameo in Spider-Man: Far From Home, with part of the film set in London.
It's all conjecture at this point, but there have also been rumours that Jessica Drew - AKA Spider-Woman - could star in Far From Home too. She was actually born to British parents in the comics, and if Marvel are looking to provide their own spin on MI-13, they could potentially look to make that character a part of the team.
As things currently stand, they're more likely to appear in Far From Home than Endgame, but if Black Knight has a chance to cameo, then so does MI-13.