The only other canonical revenge person I know of is the guy who got Kirk court martialed. Who they all thought was dead. (Not even Roger Corbin I think really gets the revenge thing, though in canon so far we have more than GM as a background for a revenge plot at all. But that does not mean JJ can't create it for GM!)

I do think it'll probably, especially with the family talk, be someone already part of the fabric of the universe as we know it.