Fate/Extra CCC Challenge
In one of the endings for Fate/Extra CCC, Gilgamesh rescued Hakuno Kishinami from being deleted by the Moon Cell, then the two left the Moon Cell and decided to explore the universe together.
The challenge is this: First decide on male or female Hakuno. Next, write about their adventures. For example, they could encounter the Servant Universe where they would meet people like Mysterious Heroine X, Space Ishtar, and Calamity Jane, or meet the Outer Gods and the Foreigners. It could be a crossover where the two encounter some kind of situation in space like Star Wars, Star Trek, Alien, Predator, Metroid, etc. They could land on a planet with new rules like Final Fantasy, The Legend of Zelda, Is It Wrong to Try to Pick Up Girls in a Dungeon, Worm, etc. The possibilities are endless.