What if Damian had a twin and not just anyone, his little sister was Marinette Dupain Cheng, or at least that was the world thought her name was when really it was Demetria Martha Al Ghul Wayne. she was the twin sister of Damian Wayne and the superheroine Ladybug. What will happen when Bruce finds out he has a daughter and the boys now have a sister, that is completely different from her twin.