What is fan fiction?

This guide covers what the form is and is not, where it came from, the types it splits into, the vocabulary it invented, what separates a good example from a forgettable one, and the part everyone asks about — copyright — as honestly as it can be put.

Three things make a text fan fiction: a borrowed world, unborrowed sentences — the prose belongs to the writer — and a reader who knows the source. The third is the one people overlook, and it is the one that actually defines the form.

The types overlap constantly — an AU can also be a crossover, a one-shot can also be a missing scene — which is why stories carry several tags at once.

Two of them need extra care. Real person fiction is about real people, so personality and privacy rights come into play on top of copyright; some platforms refuse it outright, and the ones that accept it have their own rules. Songfics that paste in a song’s lyrics raise a separate copyright question; writing what the song describes in your own sentences is both safer and better writing.

• Fifty Shades of Grey (E. L. James): first posted online as Twilight fan fiction; before it became a book the character names were changed and the ties to the source were cut.
• After (Anna Todd): began on Wattpad as real person fiction about a member of One Direction; in the published version the lead became a fictional character.
• Wide Sargasso Sea (Jean Rhys, 1966): tells the earlier life of the woman shut away in the attic in Jane Eyre, from her own point of view — one of the literary novels most often compared to fan fiction.
• Rosencrantz and Guildenstern Are Dead (Tom Stoppard): Hamlet as seen by two of its minor characters — the missing scene, done on stage.

What the four have in common: none of them copies its source’s sentences. They borrow characters and a world; the prose is the writer’s own. That is also the short answer to what fan fiction looks like in literature.

Not quite: fan fiction is a way of writing rather than a genre, and a piece of fan fiction can be a romance, a horror story, a mystery or science fiction.

A genre is defined by the promise it makes — dread in horror, a solvable puzzle in a mystery. Fan fiction makes one of those promises and adds another on top: a world the reader already knows. That is why fan fiction is tagged twice, with its source and with its genre. What each genre promises is laid out in the list of fiction genres.

• The blank page is already solved. World, characters and relationships exist. All of the energy goes into the scene, and the most common reason people stop writing — “where do I even start” — disappears.
• The readers are already there. Someone who loves the same work will find your story. For a first-time writer that means being read at all, and being read is the strongest known reason to keep writing.
• The feedback loop is fast. You post a chapter and comments arrive the same week. Writing a novel alone never builds that loop; when it exists, the rate of learning changes.
• It trains the ear for voice and dialogue. Writing in an existing character’s voice is harder than writing your own, because there is a standard and readers hold you to it. That constraint moves dialogue skill fast.
• Constraint produces ideas. “Write anything” stops most people; “write in this world, with this character” starts them. Invention works against an edge, not in open space.
• You get to write what is missing. The minor character nobody followed, the skipped year, the question left unanswered. Most fan fiction lives in those gaps.

In fairness, there is one thing it does not teach: building a world and a cast from nothing. In fan fiction that work is already done. If that is the muscle you want, the guides on how to create a character and how to come up with story ideas exist for exactly that.

Ideas and expression are different things, but the distinction is less reassuring than it sounds. Nobody owns the idea of a story about explorers in space; the sentences that tell one are a work. And characters and fictional universes are treated as part of the work in most legal systems — so “I only used the character” is not a safe sentence.

The decisive line is between commercial use and free sharing. Work that earns nothing, names its source openly, does not substitute for the original and does not damage the rights holder’s market is in practice usually tolerated; the form has lived that way for decades. Selling, printing, paywalling, writing for donations and merchandising are a different activity entirely, tolerance is not extended to them, and nearly all of the trouble comes from there.

Copyright does not last forever, but its length varies by country. When protection ends, a work enters the public domain; in many countries that happens 70 years after the author’s death. Two details are easy to miss: the term is not the same everywhere, and even when a source is in the public domain, what a later adaptation added — a film, a series, a new translation — can still be protected on its own.

Rights holders differ enormously. Some creators openly welcome fan work, some openly forbid it, and most say nothing at all. The fact that fan work for a given source has been circulating for years does not mean permission was given.

Platform rules operate separately from law. A site or app may decline to publish something that would raise no legal problem, purely under its own content rules. Read the rules of wherever you are posting as a separate matter.

The text you wrote is yours. What is borrowed is the world; the sentences are your work. When those two get conflated, writers undervalue their own rights and readers misunderstand what they are reading.

The practical habits that follow are short and unambitious:

1. Name your source. Hiding where it came from breaks the only rule the form really has.
2. Do not copy long passages, song lyrics or poems from the source. Write your own sentences; what you borrowed is the world, not the text.
3. Do not go down the commercial road without asking a lawyer in your own country first.
4. If the rights holder has an explicit prohibition, respect it — “other people are doing it” is not a reason.
5. If a takedown request arrives, take it down. Arguing costs more than the text is worth.

1. Which canon? The book, the adaptation, the later addition? Their details usually disagree. Pick one at the start and say so in the story’s notes; most fan fiction arguments turn out to be two people looking at different canons.
2. Canon or fanon? A detail the community has repeated for years can pass for canon. Using fanon is fine; using it without knowing leads to building the world’s rules wrong.
3. What am I changing? Changing is allowed, hiding it is not. Declare the change and the reader comes with you; leave it undeclared and every divergence reads as a mistake.
4. Why would this character do this? A character’s limit is not what they do, it is why. As long as you build the reason, you can take them somewhere surprising.

When several writers share one world, those four answers have to be written down somewhere: which source, up to which point, which fanon is accepted, what has been changed. The rest of the machinery of writing together is in the guide to collaborative writing.