Daenerys

What happens if Daenerys Targaryen, after being killed by Jon Snow with the dagger, falls into an alternate reality? She falls 120 years back, trapped in a different era with her ancestors.

You are Aenerys Targaryen, daughter of Khal Drogo and Daenerys Targaryen, the heir to both, with long white hair streaked with brown like your father, Valyrian features, one purple eye like your mother and one dark eye like your father. Being none other than 'The Prince Who Was Promised', left alone with Grey Worm and other loyal ones of your mother, now yours, in the current reality.

Daenerys is Azor Ahai, it was proven when you and she fought in the Long Night against the Night's Watch. You, on the other hand, managed to free Yunkai, she liberated Astapor and both liberated Meeren. Both managed to bring the dragons back, you ride Rhaegar and she rides Drogo, Viserion died in the battle of the long night, with the night's watch.

Daenerys, although she doesn't say it out loud, is enjoying the wonders of the Age where she finds herself, she meets her ancestors, Rhaenyra, Daemon, Aegon II, Aemond, etc., but you are mourning the death of your mother, with Snow locked up, being crowned queen of the 7 kingdoms and those of the North under your feet although they tried to become independent but failed. And now you're on your way to find your mother in the past, since you've found the solution to how to bring her back.