But there have been a select few characters from throughout the MCU that have been lost in the shuffle for one reason or another. I've put together a list of 22 notable characters that have since gone MIA in the MCU.
3.President Matthew Ellis (William Sadler), Iron Man 3
4.Robbie Reyes/Ghost Rider (Gabriel Luna), Agents of S.H.I.E.L.D.
ABC via Giphy
Marvel is introducing Blade into Phase Four of the MCU, but Ghost Rider is still waiting in the wings, with Gabriel Luna's iteration of Robbie Reyes still unused in the primary MCU canon despite the actor being allegedly contracted to return at some point.
5.Madame B. (Julie Delpy), Avengers: Age of Ultron
6.Gabe Jones (Derek Luke), Captain America: The First Avenger
7.Daisy Johnson/Quake (Chloe Bennet), Agents of S.H.I.E.L.D.
8.Justin Hammer (Sam Rockwell), Iron Man 2
9.The Koenigs (Patton Oswalt), Agents of S.H.I.E.L.D.
ABC via Giphy
With Patton Oswalt voicing Eros's minion, Pip the Troll, and the questionable canon of Agents of S.H.I.E.L.D. in the Marvel Cinematic Universe, it seems that any future appearances of the funny first family of S.H.I.E.L.D., the Koenigs, in the MCU are improbable at best.
10.Jackson Norriss (Scoot McNairy), All Hail the King
Marvel Studios via Giphy
When Shang Chi was announced to tie the Ten Rings back into the Marvel Cinematic Universe post-Iron Man 3, fans were curious if anyone from the One-Shot All Hail the King would find their way back into the MCU. While Trevor Slattery returned to the proceedings, Scoot McNairy's deceptive mercenary has been out of sight since his debut.
11.Eir (Alice Krige), Thor: The Dark World
12.Aaron Davis (Donald Glover), Spider-Man: Homecoming
Sony Pictures via Giphy
Marvel diehards know Aaron Davis is the uncle of future Spider-Man Miles Morales, which is why it's been so odd that there haven't been any callbacks or return appearances for Donald Glover's street-smart Homecoming character thus far.
13.Aleta Ogord (Michelle Yeoh), Guardians of the Galaxy, Vol. 2
Marvel Studios via Giphy
While the Ravagers may not have explicitly partaken in the war against Thanos at the end of Avengers: Endgame, one wonders if Aleta Ogord will have a presence in Guardians of the Galaxy, Vol. 3, considering the warm reception to Michelle Yeoh's graceful mentor character Ying Nan in Shang Chi.
14.Rhomann Dey (John C. Reilly), Guardians of the Galaxy
15.Black Bolt (Anson Mount), Inhumans
ABC via Giphy
Much like Helstrom and Cloak & Dagger, Marvel's Inhumans has been on the shakiest ground regarding their canonical placement in the MCU, leaving it highly unlikely we may see Anson Mount reprising the role of Black Bolt in the near future, if at all.
16.Mitchell Carson (Martin Donovan), Ant-Man
17.W’Kabi (Daniel Kaluuya), Black Panther
18.Felix Blake (Titus Welliver), Agents of S.H.I.E.L.D.
ABC via Giphy
For a while, Felix Blake appeared to be the Marvel's next Coulson surrogate, but Titus Welliver's commitments on Bosch and the subsequent utilization of Maria Hill have led to Blake becoming a footnote in the MCU.
19.Ava Starr/Ghost (Hannah John-Kamen), Ant-Man and the Wasp
20.Samuel Sterns (Tim Blake Nelson), The Incredible Hulk
21.Dr. Helen Cho (Claudia Kim), Avengers: Age of Ultron
In the closing moments of Spider-Man: Homecoming, the future "Scorpion" reaffirmed his vendetta against Spider-Man and casually intimidated Adrian Toomes, though the character has not been seen or heard from in either Marvel or Sony's Spider-Verse in any film since.