BlackMoon2
i believe batgirl could be his next wife once she suffer from joker shot(get it?) her emotion could get amplify by venom causing her to leave the bat family and become oracle and then become venom but still follow batman first law and then powergirl could be the next candidate
NecronFlayedOnes:knull is a God he could wait for a 100 years or on her case time skip 10years and a better option instead of the whole batman x batgirl that ship made me worship the chaos gods
got a little theory on my head right now: What if wonder woman is knull daughter i mean she got black hair and the mom seem to still love him so what if the mother of the amazons gave birth to knull child and was able to convince the greek gods that the child is made by them( blackmail here and there etc etc) and wonder woman brace and armor is nothing but a ward to keep others from knowing and a Symbiote lay dormant inside her "toxin" which explain why she can kill/defeat gods