>>213389514
This might be a waste of characters but I would rework Despero and or Mongul as Brainiacs henchman. I choose them because they don't really pose any threat in my opinion that you don't get from Brainiac or Darkseid. So kind of keep their backstories as ruthless despots of their respective worlds, but Brainiac has come along and destroyed their worlds but found them individually as worth keeping in his servitude.