Punisher- Due to Frank's distrust for all things government-run, the MCU version would have to go one of two directions: being run by the Winter Soldier or by Norman Osborn. Either way, it would be relatively easy to bring Castle into whichever version of the MCU Feige and co. went with.
If it were the Bucky option, then the Punisher could be given a soft reintroduction in the Falcon and Winter Soldier series and then the trust created between the duo and Castle could be leveraged to get the vigilante to join Barnes' new team; and if it were the Osborn version, then the fact that Stormin' Norman is an unknown quantity would make it simple to convince the audience that this is someone Frank would trust enough to join up with.
Iron Fist- As such, there is further precedent for the character to be reintroduced in Shang-Chi's origin film, with the matter of kung fu also being based on the continent.
Ideally, they would meet while both seeking out Orson Randall - a previous Iron Fist that Rand was searching for at the very end of his Netflix series. Sure, Shang-Chi doesn't exactly have any relation to Randall, but it would be fantastic to see the character properly brought to the MCU, and using a reintroduction of Iron Fist in Shang-Chi's movie would be a great way to do it.
Luke Cage- At one point or another, there will be some sort of superhero battle in New York (whether that be with the entire Avengers team or simply one of its members) - which Cage could see step in (he is the defender of Harlem, after all) and then be slowly inducted into the group as the movies go on, with him eventually stepping up to a leadership role in the years that follow.
Jessica Jones- Her introduction into the MCU...best way to do it: likely would have to be to just have Luke Cage invite her to join the Avengers after he was inducted into the group if the team required additional help
Daredevil
If it were the Bucky option, then the Punisher could be given a soft reintroduction in the Falcon and Winter Soldier series and then the trust created between the duo and Castle could be leveraged to get the vigilante to join Barnes' new team; and if it were the Osborn version, then the fact that Stormin' Norman is an unknown quantity would make it simple to convince the audience that this is someone Frank would trust enough to join up with.
Iron Fist- As such, there is further precedent for the character to be reintroduced in Shang-Chi's origin film, with the matter of kung fu also being based on the continent.
Ideally, they would meet while both seeking out Orson Randall - a previous Iron Fist that Rand was searching for at the very end of his Netflix series. Sure, Shang-Chi doesn't exactly have any relation to Randall, but it would be fantastic to see the character properly brought to the MCU, and using a reintroduction of Iron Fist in Shang-Chi's movie would be a great way to do it.
Luke Cage- At one point or another, there will be some sort of superhero battle in New York (whether that be with the entire Avengers team or simply one of its members) - which Cage could see step in (he is the defender of Harlem, after all) and then be slowly inducted into the group as the movies go on, with him eventually stepping up to a leadership role in the years that follow.
Jessica Jones- Her introduction into the MCU...best way to do it: likely would have to be to just have Luke Cage invite her to join the Avengers after he was inducted into the group if the team required additional help
Daredevil
- Spider-Man fights several villains, but is being overpowered and beaten.
- He ends up being thrown through an window into a dimly lit hallway and the villains follow him in.
- Before they can finish off Peter, one of them notices a figure in the shadows.
- Daredevil steps out akin to bearded Cap in IW and fights the villains in a long take sequence.
