There's so many. Both are on Earth.
Since I've been focused more on a certain universe lately I will say that I would love a Battle Angel Alita game. A recovered, super developed, post apocalyptic future where there are planetary/lunar factions in the solar system. A world where cyborgs are a common thing, and all you need is your brain intact to exist. Also imortality tech exists. Of course I would love to play as Alita.
Berserk world. A terrifying medievil era where demons and monsters live either secluded or hiding in plain sight, and that at some point due to an event that the main character (Guts) endured all these creatures are now visible to every human. Guts wields this massive sword, has an arm cannon, and eventually gets this badass armor that helps him wreck everything around him and himself.


