This is the least well known Marvel Movie Character

The name Captain Marvel has a long and sorted history but I will shorten it as much as possible.

Fawcet Comics had a character named Captain Marvel who was a really fast, flying, super strong guy.

DC sued them because he was too much like Superman (while they looked similar, Cap Marvel was actually flying before Supes but DC had stronger lawyers) and that led to Fawcet Comics going under and DC sitting on the rights to Captain Marvel for decades.

In the 70's, Stan Lee realized the name Captain Marvel was no longer under copyright since no comics had been published with that name in decades and created the character Captain Marvel (because hey, they were Marvel Comics, so they needed a Captain Marvel, apparently). Later, this guy got a female counterpart named Ms Marvel; real name: Carol Danvers. There have been several characters at Marvel who used the name Captain Marvel after that as the original guy died, but eventually, Carol Danvers began using the name Captain Marvel (Carol went through several name changes herself in the meantime, btw).

As for DC, they brought back "their" Captain Marvel in the late 70's, but since Marvel was publishing Captain Marvel comics, they used the title "Power of Shazam" when it came time for their Cap Marvel to have his own title. These days, the character goes by Shazam which is why the upcoming movie has that title.

I agree, to me Ms. Marvel is just the source of Rogue's powers and she's in a coma. But Disney and Marvel have managed to get away with murder, the more boring and homogenized the films the better.

I would rather see a Spiderwoman or She Hulk movie.

And because she's little-known, the fillmakers will feel zero obligation to be true to the source material.

Nobody had ever heard of the Guardians of the Galaxy either. I'd say that worked out alright.

Marvel Comics basically stole the name when the Real Captain Marvel was in Legal Limbo.