The Emperor wasn't sure how he ended up in a different universe, or what the parasite leeching off Humanity was. But he was the guardian of Mankind, and there was at least one person on this world worthy of taking up his mantle.

Red Hood died when the Dimensional Transporter exploded, snarling in the face of the Regime. Several dimensions away Izuku Midoriya woke up with skills he didn't remember learning, memories that definitely weren't his, and half an answer to the question that had plagued him all his life: can someone without a Quirk be a hero?

Voldemort was dead, but his rule and his ideals lived on. The Resistance had failed, their Saviour had fallen, and Hermione Granger went back in time to fix things. Unfortunately someone else tagged along for the ride.

Sarah Potter is the Girl-Who-Lived. Her life would never be normal, so a dimension travelling ex-Dark Lord version of herself wanting to help in her quest to stay alive? Par for the course, really.