If I am being completely honest, though, there is only one X-Men character I believe Andra Day would deserve to be cast as over any of them. Ororo Munroe (better known as Storm, and previously portrayed by Alexandra Shipp and Halle Berry) is one of the most powerful and popular women in comic book history, and should, undeniably, be a major part of the MCU once she and her fellow mutants are inducted.
The only issue is that Andra Day would have a little competition to face, as fellow singer/actress Janelle Monae has also campaigned for the role in the past. Plus, we would not be able see Storm share the screen with her husband, T’Challa, following the death of Black Panther star Chadwick Boseman in 2020. On the bright side, if Day were to win the role, the possibilities of what she could do to make it all her own, by bringing the same unstoppable fierceness she brought to Billie Holiday, are endless.