A world in which wars are decided on whose citizens are the prettiest. Battlefields are filled with women in bikini chainmail and men in loincloths. This may be comedic at first, but then consider what nations would do to keep their citizens beautiful. Hint: it’s not pretty.
Fighting to become the best in the world, hundreds of teenagers kill each other, and the last man and woman standing become king and queen. Once this happens, the new monarchs enforce this fate on a new generation. Your protagonists, decidedly the “good guys,” do not change this absurd tradition. Why?
The prophesied hero fails to fulfill the prophecy, and so his hometown government has her stoned to death. She comes back as a zombie and fulfills the prophecy. Her village is then wiped out by a horde of paladins razing for justice or something, I dunno. Justice needs to happen.
A planet on which every word spoken and every sound produced can be heard around the world.
Items that, when touched by someone, are bound to them and cannot be used by anyone else.
Write the story of an ordinary guy who tries to become a villain, decides it’s too hard, and becomes a hero instead.
Write an ordinary story involving a god of some sort, then have the plot twist be that the god is an artist, and that the characters are merely paintings imbued with the ability to think.
A yearly challenge during which people can’t speak any words of their own language for an entire week.
Every year, on a person’s birthday, they start an epic journey to do something amazing. Usually it’s doing something great for their family or community, but some lucky kids get to save the world or rescue princes and princesses.
Also, I’m 21 today.
Everything in the world is capable of leveling up on its own: buildings, weapons, armor, people, computers (if they exist in your setting).