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AU Generator — Free Alternate Universe Prompts

Instant alternate universe prompt generator for fanfic writers. Coffee shop AU, soulmate AU, college AU, rivals, royalty, supernatural, and more — copy-paste ready, no signup needed.

Coffee Shop AU

Character A is the barista who deliberately misspells Character B's name every single day just to see their flustered reaction when they correct it. It starts as a joke. It stops being funny when Character A realizes they've memorized every expression Character B makes.

Romance

What Is an AU Generator?

An AU generator (alternate universe generator) creates ready-to-use fanfiction scenarios that transplant your favourite characters into a completely different world or setting. AU is one of the most popular fanfiction genres on AO3, Wattpad, and Tumblr — coffee shop AUs, soulmate AUs, college AUs, and enemies-to-lovers rivals AUs have tens of millions of works across every fandom.

This AU generator gives you 60+ copy-paste prompts across 10 AU types. Each prompt is designed to set up a character dynamic — not prescribe every beat of your story. Take the scenario, apply your ship, and write the fic only you can write.

60+ AU Prompts by Type

Coffee Shop AU

Romance

Character A is the barista who deliberately misspells Character B's name every single day just to see their flustered reaction when they correct it. It starts as a joke. It stops being funny when Character A realizes they've memorized every expression Character B makes.

Rivals

Character A owns a failing independent coffee shop next to a corporate chain where Character B works as the regional manager sent to assess 'competition.' Character B starts buying coffee there every morning and helping fix the menu on napkins.

Meet-Cute

Character A has been coming to the same cafe for two years and always orders 'the usual.' Character B is the new barista who has to ask what 'the usual' is — and accidentally starts a tradition of asking Character A about their day instead.

Slow Burn

Character A is a night-shift barista who only ever sees Character B in the hour before close, nursing the same cold coffee. They never speak beyond the order. One night Character B doesn't show, and Character A realizes how much they were looking forward to it.

❤️ Soulmate AU

Comedy

In this world, the first words your soulmate says to you are tattooed on your wrist at birth. Character A's tattoo reads: 'You're in my spot.' Character B's reads: 'I've been sitting here for three years, that's literally my spot.'

Angst

Soulmates share each other's pain. Character A has never once been hurt — which means their soulmate is either very lucky or very careful. Then one day every bruise shows up at once.

Bittersweet

In this world, you see in black and white until you meet your soulmate. Character A is a world-famous photographer known for their stunning black-and-white work. They never want to meet their soulmate — colour would ruin everything.

Slow Burn

Soulmates share a dream space. Character A and Character B have been meeting in dreams every night for years but have never used their real names. Character A just started a new job. Their new coworker says something that sounds very familiar.

📚 College / University AU

Comedy

Character A and Character B are assigned as college roommates. One is an absolute neat freak with a colour-coded calendar. The other leaves dishes in the sink and survives on instant noodles. They communicate exclusively through passive-aggressive sticky notes for three weeks before a 2 AM power outage forces a conversation.

Humor

Character A is the student tutor that Character B's parents forced them to hire. Character B is actually better at the subject than Character A. Neither of them mentions this for six sessions.

Romance

Character A and Character B both reach for the last copy of the required textbook at the campus bookstore. They decide to share it. This requires seeing each other every other day. The semester is sixteen weeks.

Slow Burn

Character A is studying at 3 AM in the 24-hour library when Character B slides a coffee onto their table without a word and sits down across from them. This happens every night for a month before anyone speaks.

⚔️ Enemies to Lovers / Rivals AU

Comedy

Character A and Character B are rival bakers competing for the same lease on a storefront. The pranks escalate across eight months. They accidentally get locked in the same walk-in freezer the night before the final decision. There is one emergency blanket.

Rivals

Character A and Character B have been competing for the same promotion for two years. The night one of them finally gets it, the other's car breaks down in a storm. There's only one person who answers the phone.

Slow Burn

Character A is the new transfer student who immediately sits in Character B's unassigned-but-somehow-always-their seat. Character B is furious. Character A doesn't move. This becomes the entire basis of their relationship for a year.

Comedy

Character A and Character B have been in a bitter online rivalry in the same fandom for three years — different ships, different interpretations, legendary arguments. They just matched on a dating app and neither has made the connection yet.

💌 Fake Dating AU

Romance

Character A needs a fake date to their sister's wedding so their family stops asking questions. Character B owes them a favour. The problem is that Character A's family is so warm and lovely that Character B starts to forget it isn't real.

Slow Burn

Character A and Character B fake-date for a month so Character B's ex gets the message. By week two, Character A has met all of Character B's friends. By week three, Character A knows their coffee order. By week four, they both forget why they started.

Celebrity

Character A is a celebrity. Character B is their publicist who suggests fake-dating to manage a PR crisis. The crisis blows over in two weeks. Neither one brings it up.

Comedy

Character A and Character B agree to fake-date over a family holiday so their respective parents stop trying to set them up with strangers. They share one guest room and one very narrow air mattress. No one sleeps.

👑 Royalty AU

Reveal

Character A is the reluctant prince who slips away from the palace in commoner's clothes once a week. Character B is the street vendor who's been selling them fruit for six months and has absolutely no idea. The coronation announcement changes everything.

Political

Character A is a foreign dignitary sent to negotiate a trade agreement. Character B is the interpreter assigned to them. They start using language the other doesn't know to say things they'd never say to each other's faces.

Drama

Character A is the youngest royal who was never supposed to rule. Character B is the advisor assigned to them when everything changes. Character B has all the plans. Character A has none. This is going to be a very long reign.

Banter

Character A is a queen. Character B is the knight who saved their life once and hasn't stopped hovering since. Character A insists they don't need a bodyguard. Character B disagrees. Loudly. At every meal.

🌙 Supernatural / Fantasy AU

Comedy

Character A is a vampire who has lived in the same apartment building for forty years without anyone noticing. Character B just moved in and immediately invites them to every daytime event. Character A is getting desperate and creative.

Magic

Character A is a witch whose spells always go wrong in ways that accidentally help people. Character B is a skeptic who keeps ending up as their accidental beneficiary. Character B is starting to believe in things they can't explain.

Supernatural

Character A is a ghost haunting the house they died in. Character B buys the house, renovates every room, and talks out loud to the walls when they think no one's listening. Character A starts talking back. Character B doesn't realize for three weeks.

Paranormal

Character A is a werewolf who has always handled full moons alone. Character B is their new neighbour with insomnia who keeps opening the door at exactly the wrong moments. Character A has run out of plausible excuses.

🏛️ Historical AU

Epistolary

Character A and Character B are corresponding by letter across different continents in 1890. Neither knows what the other looks like. They've written 200 letters over four years. Character A is about to board a ship to London.

Period Drama

Character A is a painter in 1920s Paris. Character B sits for their portrait once — a favour for a mutual friend — and keeps coming back to check on the work's progress. The painting has been 'not quite right' for six weeks.

Angst

Character A is a soldier who writes letters home addressed to their best friend. Character B receives the letters by mistake. They answer. Neither corrects the error. The war lasts three more years.

Historical

Character A and Character B meet at a train station in 1943. Their trains go in opposite directions. They have forty-five minutes on the platform. Character B gives Character A their address. Character A carries it for two years.

🏙️ Modern / Slice of Life AU

Neighbors

Character A and Character B have been next-door neighbours for three years and communicate exclusively through very passive-aggressive Post-it notes left on the shared wall. Neither has ever knocked on the other's door. A burst pipe makes this impossible to continue.

Modern

Character A accidentally texts the wrong number at 2 AM in a panic. Character B texts back. Somehow, this becomes a habit. They've never spoken on the phone. They've never exchanged names. They know more about each other than most people do.

Slow Burn

Character A and Character B work in the same office building and share an elevator every morning for two years. They know each other's floor, their coffee preference, and their worst meetings. They have never introduced themselves.

Bittersweet

Character A is moving out of the apartment. Character B is moving in. They spend exactly one afternoon passing boxes in the doorway and helping carry furniture up three flights. Character B finds Character A's forgotten notebook a week later.

🏆 Sports / Competition AU

Rivals

Character A and Character B are rivals in the same sport — they've been trading the top ranking for five years without ever speaking. At a tournament, they're assigned the same training facility time slot. One hour every morning. Six months until nationals.

Mentorship

Character A is a retired professional athlete hired as an unlikely coach. Character B is their most difficult, most talented student who argues with every note. Character A recognizes everything they hated about themselves in their early career.

Teamwork

Character A and Character B are teammates who don't get along. Then they're paired for a competition that requires absolute trust. They have three weeks to either figure it out or lose the whole season.

Sports

Character A wins the championship. Character B comes in second for the third time in a row. Character A looks for them in the crowd before they find their own team. Nobody notices but Character B.

How to Use AU Prompts

  1. 1 Pick your AU type — or hit "Generate AU Prompt" for something random. Some writers browse by type; others let the generator surprise them.
  2. 2 Swap in your characters — replace "Character A" and "Character B" with your ship. All prompts are character-neutral so they work for any pairing in any fandom.
  3. 3 Use it as a springboard — a prompt sets the setup, not the ending. Diverge, combine prompts, or let the scenario take you somewhere the prompt didn't plan.
  4. 4 Share on AO3, Wattpad, or Tumblr — no attribution required, but many writers drop a "based on a prompt from randomprompts.org" note in their author's comments.

Writing Great AUs — Do's and Don'ts

✓ Do

  • Keep your characters' core traits intact — the AU changes the setting, not who they are
  • Let the AU setting create natural conflict that fits your ship's dynamic
  • Blend AU types for more interesting setups (soulmate + college, rivals + royalty)
  • Leave room for slow burn — the best AUs earn their resolution

✗ Avoid

  • Changing core personality traits so much they stop feeling like your characters
  • Skipping to the resolution — the tension is the point
  • Forgetting the AU setting's rules apply consistently (a vampire can't just casually go to a beach day)
  • Ignoring what makes your ship specific — generic AUs don't land as well as ship-specific ones

Related Writing Tools

Frequently Asked Questions

What is an AU in fanfiction?

AU stands for Alternate Universe. It's a fanfiction genre where the characters from a fandom are placed in a different setting or reality than their original canon — a coffee shop, a university, a historical period, or a fantasy world. The characters keep their core personalities and relationship dynamics, but the context is entirely new.

What's the most popular AU type?

Coffee shop AU and soulmate AU are consistently among the most popular across fandoms. Enemies to lovers, fake dating, and college AUs also have massive followings on AO3 and Wattpad. The best AU type depends on your fandom and which character dynamics you want to explore — rivals work differently in a royal court than in a university.

How do I use these AU prompts?

Replace 'Character A' and 'Character B' with your ship or characters of choice. The prompts are deliberately character-neutral so they work with any pairing from any fandom. You can use a prompt as your opening scene, as a mid-fic plot device, or just as a spark to find your angle — you don't need to follow it exactly.

Can I combine AU types?

Absolutely — many of the best AU fics blend types. A coffee shop AU with a soulmate twist, or a fake dating AU set in a historical period, often creates more interesting conflict than a single-type AU. Use multiple prompts as building blocks and see what resonates with your ship's dynamic.

What's the difference between AU and canon divergence?

Canon divergence stays within the original world and continuity but changes one key event (e.g., 'what if character A survived?'). An AU changes the entire setting — the characters exist in a completely different world or context. Both are widely written, but AU gives you more freedom to reframe character dynamics without being constrained by canon events.

Where can I share fics written from these prompts?

Archive of Our Own (AO3), Wattpad, Tumblr, and DeviantArt are the main platforms. Many writers also share on Reddit communities (r/FanFiction, fandom-specific subreddits) or Discord servers for their fandom. You're free to use these prompts for any fic — no attribution required.