Food and drink combinations that grant different types of magical power. Food alone or drink alone does nothing, but, say, almond milk combined with milk chocolate gives a huge strength boost.
A factory that mass-produces heroes and heroines for struggling villages to buy and use against their respective evil overlord types.
A world in which people gain experience points for every task they complete. These experience points build into a mostly arbitrary level system that determines what privileges they have within society, such as voting or reproduction.
A species of sentient creatures shaped like beds, that can also serve as beds. These bed-beasts can’t move on their own, and draw nutrients from the humans that sleep on them, while also providing nutrients that help humans sleep better and wake up faster.
Maybe toss in some disgruntled traditional bed-makers in there somewhere.
A world composed almost entirely of teenage high fantasy protagonists and their evil overlord foils (who may or may not be the protagonists’ fathers).
An economic system that uses heroic deeds as a form of currency.
A magic system in which people can save fully immersive copies of their memories in some sort of storage bank, accessible by recalling the general date of the memory.
A story in which the “evil” overlord actually brings about an era of peace and prosperity in which the vast majority of his citizens are actually happy.
To improve themselves, people have to hack into their own minds and input a command allowing their environment to make changes to their minds.
A real-life user-interface that hovers in front of people’s eyes at all times, tracking things like their heartrate, level of hunger, energy, level of happiness, etc.