This is an interesting question in that announced doesn't necessarily mean that it will get made because of different things that happen along the way.

I am not that familiar with what's going on within the DC Extended Universe (DCEU) as I think I am with the Marvel Cinematic Universe (MCU), so I'll concentrate on potential characters from Marvel after I rule out those which would not be a contender for the purpose of this question.

MCU

Since there's been more than one studio making Marvel based character movies (Fox and Sony along with Marvel Studios, which is usually referred to as the MCU), I'll just say that I'm confining this to the MCU, especially since the parts of Fox that produced the X-Men, Fantastic Four and Deadpool are now with Disney, Marvel's parent company.

ALREADY MADE OR ANNOUNCED

With that in mind, movies in the works I've heard about with characters that don't have one yet include: The Eternals, Black Widow, and a martial arts kind of character named Shang-Chi. The rest of the movies that seem to be on the docket for Marvel's phase four are all characters that already have movies, including the Spider-man movie coming out later this year, and then a Black Panther 2, Doctor Strange 2, and Guardians of the Galaxy 3.

(As I said earlier, I'm excluding all the rumored X-Men Universe heroes, too, like Gambit and The New Mutants, along with any other Sony/Spider-man movies, like Venom 2, Morbius, Into the Spiderverse 2, etc.)

I'm kind of surprised that the Eternals seem to be high on the list for a movie, since they are characters that are lesser known, even in the comic books, but we'll see how that goes.

KNOWN CHARACTERS BUT UNLIKELY

Of the characters that Marvel has introduced that don't have their own movie or one announced, there's Hawkeye, maybe one with Scarlett Witch and a revived Vision, although the last two may or may not have a TV or streaming series of some kind happening.

Others considered in the MCU, but not likely to get movies yet are Daredevil, Luke Cage, Iron Fist, Jessica Jones or the Defenders. That would probably also exclude a Punisher or King Pin movie, where the focus is more on the villain. The first Daredevil and Elektra movies did not go over well, nor did the previous Punishers.

With those characters out of the way, here's a short list of potential movies for characters without a film, or one announced.

MOON KNIGHT

Now that I've excluded all of those, I think Marvel should introduce Moon Knight, perhaps through a Doctor Strange movie, and then give him his own. He's been an Avenger, so there's a possibility there, and while his powers are mystical/magical, his alter ego, Mark Spector, has some ongoing personality disorder/issues that might be interesting to explore.

SHE-HULK

She's had a hard time keeping her own comic book series going, but she's also been an Avenger, a member of the Fantastic Four, and while her cousin the Hulk hasn't done well with either of his solo movies, her alter ego is much more likable than what Bruce Banner has been, and she has total control over her powers. She could be introduced maybe in Black Widow or maybe another Antman/Wasp sequel.

SPIDER-WOMAN

Another female superhero with a good amount of story, with some conflict along the way, Spider-Woman could also be a possibility. Especially if Sony continues to retain the rights to most of the Spider-man universe. Apparently, she doesn't really belong to it, so would be free to be a part of what the MCU might have going on moving forward.

Since the Skrulls have been introduced through the Captain Marvel movie, it's possible that a version of 'Secret Invasion' could be in the works, and Spider-Woman actually plays a pivotal role in that, anyway.

Okay. I think that's it.