Which popular characters remain to be added in the game?
I think it's pretty unlikely for a marvel fan that doesn't read too many comics to start playing the game and not find their favourite characters. Even though most new champions for a while now seem obscure, the game seems to have covered most recognisable characters in one way or another:
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Mystique: I believe she is the most obvious examples by far. She has been a core part of xmen stories for likely an eternity. I think Kabam has said that the problem are her animations, because they may cause issues to older devices, similar to what happened to Quicksilver
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Cloak and Dagger: They have gotten a lot of moments to shine throughout the past years, being in many videogames, TV shows (having a failed one by themselves) and general coverage. But tbh they would most likely work together as one character, since Cloak is a bit difficult to work by himself
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Most Inhumans: I mean, after the controversy that happened a few years back, it's self explanatory. But Maximus, Crystal and Triton could be fantastic additions
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(Why not?) Madame Web: She does have her own movie which attracted a lot of attention. Not praise, just attention. Nonetheless she is a really interesting character tho and could fit well with the other Spider-Verse heroes. Since Morbius is in the game, chances are never zero