As for Alpha, that character is speculated to be Anelle, the daughter of Skrull Emperor Dorrek VII, with the Delta character rumored to be Dorrek VII.
Back in July, Marvel confirmed at Comic-Con that the villains in Captain Marvel will be the iconic aliens known as the Skrulls, and that the movie will be set in the 1990s.
Marvel is seeking males between 20 and 49 for the Delta character, who must be over 6 feet tall, “broad shouldered and muscular.”
What’s interesting is there have been reports that part of Avengers 4 is shot in Japan, and that Avengers 4 will feature Captain Marvel returning after a long absence.