Just_for_fun1997
Jacob Black. Rebecca Black doesn't add nothing to plot. It will change canon to much. Jacob, is already established, as The Strongest Shifter in Twilight Verse. Plus a female shifter being the strongest doesn't make sense. Not to be sexist. A man is physically superior to a woman in every aspect. Of course a woman is much flexible, and agile then a man is. I suggest, making her, the strongest female shifter, the tribe has ever seen, while Jacob is the strongest shifter.
I can't remember if you already had anything for Leah if you haven't have Rebecca be Jacob's older twin sister but have her be born intersex and her and Leah be in each other's imprints with Rebecca being a rightful Alpha. and for Ability wise Rebecca can be able to transform into a bipedal werewolf like from Hugh Jackman's Van Helsing