Captain Marvel is one of the characters that I really enjoy using. Her offense game sucks despite her being an 8 way air dash/ flight character due to her shitty normals. In a way, she reminds me of viper. Contrary to popular belief, Vipers offense wasnt that great either. Her air normals are pretty crappy and same with her plink/wave/air dashes. What she did excel was blowing up other characters offense. So what did Viper players do? They paired her with assists that puts your opponent in long block stun to let get more mix ups since she has trouble forcing a hit.
That being said, I think Captain Marvel really needs a character that puts the opponent in long block stun to make her work and compensate for her shit normals. Slide is the exception though. That move is godlike. I would consider also learning blitz+tag crossup/non crossup shenanigans to open people up. Not sure how legit this is though.
Her hammer fist (air d+hp) has some interesting properties. Its faster than j.hk and a wider hitbox than almost all her other air normals and can cross up easily. However, it causes her to bounce off. You can cancel the bounce into an air dash but only if you haven’t used your air dash before if i remembered correctly.
Crouching lks in this game are pretty bad. Aside from not being able to rapid fire, its almost twice as slow as crouching lps averaging 7-8 frames start up. For some reason, they made upbacking invincible to lows, yet not to mids, so a complete shift from the previous games.