In the comics, M’gann is a White Martian though she looks like (and pretends to be) a Green Martian.
But, it remains to be seen how well these new characters will fit into the expanding world of Supergirl.
It was previously teased by Harewood himself that, since the show has moved to The CW, Supergirl season 2 will include more Martian Manhunter – specifically, he said, more “alien superhero stuff.”
Miss Martian (Sharon Leal) and her arrival will force J’onn to confront his past.