Phyla-vell
Carol Danvers should face off with a villain who could really challenge her strengths, such as another intergalactic warrior of Kree origin who wants to take the Captain Marvel moniker for herself, which was, somewhat the agenda of Phyla-vell, Mar-vell’s artificially created daughter, when first introduced to Marvel comics. Of course, the current Captain at the time was her brother, Genus, who had gone insane, so her intentions to usurp the title was not self-serving, yet she has been known to butt heads with some of her colleagues, such as the Guardians of the Galaxy under the name Martyr. Therefore, if Kaley Cuoco were to be cast as the white-haired, extremely powerful being, she has the chance to either be a temporary obstacle for Captain Marvel or send Star-Lord on a funny power trip at her disposal and either one sounds irresistible.