I'd like to see Marvel comics create a new character that isn't a legacy character of someone that would later appear in phase seven and so on. Like when I think of newer faces of Marvel Comics, the most popular characters took someone's mantle or a carbon copy with some variations and thats just eh.
Miles Morales - Spider-Man
Kamala Khan - Ms. Marvel
Laura Kinney - the Wolverine
Amadeus Cho - Hulk
Marvel ComiXs have the resources to introduce someone new that isn't a clone or legacy character of an eXisting Marvel character, and make that character the neXt big Marvel character.
I agree. But I think introducing a character in the comics and pushing them to popularity only through that is near impossible at this point. They put some of those characters in books with names like "Iron Man", "Hulk", etc. because those big names are dang near the only books that sell enough anymore to justify their own existence. They have occassionally tried introducing a new hero in a solo run, but those tend to be massive flops because nobody buys issues for something like "Mosaic", who pretty much has disappeared from the Marvel universe entirely after his own mini series ended.
I think their best shot within the comics themselves is to at least make sure the character is also part of an arc in some established book, like being part of a story that involves other big heroes or joining a team with bigger heroes. And really, rather than trying to explode a character from first introduction in a solo book to succesful franchise they really should pay attention to supporting characters that resonate with readers and can be expanded upon. Or at least introduce characters in other books with the intent to grow them. After all, Wolverine started as a Hulk supporting character, Black Panther started in Fantastic Four, Punisher in Spider-Man, Black Widow in Iron Man, Moon Knight in Werewolf by Night, etc.
But even that alone won't be enough. I really think that nowadays they pretty much need to include such characters in other media if they want them to last. Like I said before, I really believe that Gambit being on the team in the 90s X-Men cartoon and being playable in the Marvel VS Capcom games not long after his first comic appearances are a big part of why he's still as relevant today as he is. And Joaquín Torres is a legacy character so not the best example, but I think his existence in the MCU has the potential to make the difference between him being a character that gets forgotten completely in a few years and him becoming a major character for a long time to come. The MCU in that sense is not only valuable for the money it brings in by itself, but also the exposure and popularity it can give to characters.
Also with regards to the list you posted I think Amadeus Cho is the odd one out, because he was already a hero in his own right
before becoming the legacy hero. Similar to how Sam Wilson was already a hero before becoming Cap. I hope that if we see him in the MCU he can just be himself. I've always prefered him as just "Amadeus Cho" either solo or as a buddy team-up with Hercules. In fact, I think an "Amadeus & Herc" movie is the way to go to introduce both characters into the MCU because that dynamic of it being a double act serves multiple purposes. Firstly, I think the two characters just supplement each other well. Secondly, pairing Herc with Cho immediately sets it apart from Thor's run as a solo mythological character. Thirdly, unlike Thor there have been loads of Hercules movies and shows (Disney animated, Kevin Sorbo, Dwayne Johnson, Kellan Lutz, etc.) so pairing him with Cho would set that movie apart from those. Fourthly, because Hercules is a well known pop culture character he may still draw a lot of normies to the movie that Cho wouldn't attract on his own.
Hmm. Kamala Khan is heavily tied to Carol Canvers which is going to be the case in the upcoming movie. For me, I just wish they just called her Fangirl or something. Giving the "Ms. Marvel" codename forever made her a legacy character.
I think there's gradations to being a legacy character. Some characters are very clearly legacy characters like Danny Ketch as Ghost Rider or Sam Wilson as Captain America. A character like Kamala does have the same name as Carol used to have because that title will simply sell more issues than a new name, despite the fact that they really aren't very similar at all. They could've made her a fan of Jean Grey and made her the new Marvel Girl instead and almost nothing would've changed. In a similar way I feel like Hulkling is barely a legacy character to Hulk. Sure, the name and design are somewhat similar but the origin and powers and themes are completely different and they don't really have anything to do with each other at all. Or Monica Rambeau who also randomly got that name despite having nothing to do with Mar-Vell.
I don't think the codename itself necessarily will make her forever a legacy character. Otherwise these would also all be legacy characters:
Johnny Storm's Human Torch (from Jim Hammond)
Bruce Banner's Hulk (from Xemnu)
Johnny Blaze's Ghost Rider (from Carter Slade)
Stephen Strange's Doctor Strange (from Carlo Strange)
Natasha Romanoff's Black Widow (from Claire Voyant)
Vision (from Aarkus)
Sam Wilson's Falcon (from Carl Burgess)
Warren Worthington III's Angel (from Thomas Halloway)
Hercules (from Varen David)
Maxwell Dillon's Electro (from Electro the robot)
Arthur Douglas/ Drax "The Destroyer" (from Kevin Marlow)
and I don't think anyone considers all of these legacy characters nowadays.