- Experienced officer of USAF/NASA/SWORD (she's not some rookie, her age fits well here)
- Strong, independent female (Theron has played a number of roles as a strong female ex. Monster, Young Adult, Prometheus, Valley of Elah, etc....all in critically acclaimed performances)
- Theron has done comedy (Ms. Marvel isn't a comedian, but in the MCU and under Whedon, there's plenty of humor. See Young Adult, Arrested Development, etc.)
- Physical appearance (agreed, blonde and hot is not hard to come by, but nonetheless, Theron fits this bill)
- Star Power (no denying Theron brings even more publicity to the the already huge franchise)
- Theron is no stranger to the genre of big budget flicks (Prometheus, Hancock, Mad Max, SWATH, etc.)
Theron screams Ms. Marvel to me (or Captain Marvel). Everything about her, her talent, and her experience, leads me to believe she has what it takes to make Ms. Marvel a real presence on screen, not just some blonde who flies around and occasionally has an effects shot.