When they said there were a lot of characters in Avengers: Endgame, they really weren't kidding. All-in-all, there are more than fifty, with extras and named but unimportant supporting characters on top of that, which goes some way to explaining both why it's so long and why so many characters have their screentime limited.
The real genius of the film is that even with such an enormous cast, the Russos managed to maintain an intimate focus alongside the huge spectacle and that any character compromises are mostly completely justified. Inevitably though, there has to be some sort of hierarchy of characters (not merely in terms of powers or impact on the plot) and one of the conversations that will inevitably rage on well after the film is out of cinemas is who takes the crown as the film's best.
So who were the real stand-outs and who got shafted by the Russos' enormous ensemble sequel? Strap in...
50. Kraglin, Vision, Nakia, Erik Selvig & Everyone Else They Dropped
In short, this little group of characters were screwed badly, simply by not being included at all. Vision is probably the most erroneous absentee (though he is believed to be permanently dead so you can sort of understand it and he at least gets a mention). There's a picture of Selvig briefly shown, but neither Nakia or Kraglin are mentioned at all, though the latter does appear very briefly in the final battle, which makes sense since Sean Gunn was on-set for Rocket.
But since you have to strain your eyes to even see him, he barely even counts as an included character. So, now on to those who actually appear properly...
49. Harley Keener
You might not have noticed it was him, but Tony Stark's little friend from Iron Man 3 turns up very briefly at the very end of the movie to take part in Tony's memorial service. He looks nothing like he used to, so it's easy enough to miss him, but really, all he is is an Easter Egg.
No lines, no interactions with other characters and nothing to suggest what's happened to him since he last appeared means he's no more than present.