"The App" (short story): "The App" is a science fiction short story by Robert R. Reed. In this story, a character named Landon discovers an app on his smartphone that allows him to create and manipulate an entire universe. With each use of the app, he creates a new universe with its own laws of physics and observes the evolution of life within it.
"God Emperor of Dune" (novel): In the "Dune" series by Frank Herbert, the fourth book, "God Emperor of Dune," features the character Leto Atreides II, who transforms into a human-sandworm hybrid and rules over the universe for thousands of years. Leto gains the ability to see the future and shapes the destiny of humanity, essentially acting as the creator of a vast empire and its social, political, and ecological systems.
These examples explore the concept of a single entity having the power to create and control an entire universe within the realm of fiction. They delve into the implications of such creations and the impact they have on the characters and the narratives of the respective stories.