What 2,200 AI Fanfiction Writers Actually Write About (2026 Data)

Fanfiction is one of the largest bodies of creative writing on the planet, and it is quietly becoming one of the most common things people write with AI. We wanted to know what fic writers actually reach for when an AI tool removes the blank-page problem. So we looked at the data.

This is a first-party dataset: every figure below comes from real books created on Inkfluence AI, not a survey or a guess. Of more than 47,000 books written on the platform, 2,210 were tagged to an existing universe, spread across 1,179 different fandoms. That long tail is the headline on its own: fan culture is enormous and specific, and AI writing has not flattened it into a handful of safe choices. People are writing fic for everything from Hogwarts to obscure mobile games.

For context on scale, fanfiction is not a niche hobby. Archive of Our Own alone hosts over 17 million works across 77,000+ fandoms. Our slice is small next to that, but it is one of the only public looks at what people choose when they write fic with AI specifically.

Direct answers about AI fanfiction in 2026

The 20 most-written fandoms (ranked)

Here is the full ranked list, with variant spellings and author suffixes merged into a single entry per fandom. Counts are the number of distinct AI fanfiction projects in each universe.

Why anime dominates AI fanfiction

The single clearest pattern in the data is anime. My Hero Academia, Naruto, Jujutsu Kaisen, and One Piece take four of the top five positions, and the anime and manga category is the largest once you group titles together. That tracks with where fandom energy lives online right now, and it has a practical consequence for tooling.

Anime fandoms run on long, interconnected arcs with large casts, evolving power systems, and timeline rules that fans police closely. That is exactly the kind of story where a one-shot generator falls apart and a structured, chapter-aware tool earns its keep. A continuity system that remembers what happened in chapter 3 when it writes chapter 15 is the difference between a fic that respects canon and one that contradicts itself by the second act. This is why so many anime fic writers gravitate to an AI novel writer built for multi-chapter work rather than a chat tool that forgets details.

K-pop also shows up strongly. BTS lands at number six, the highest real-person fiction entry, which mirrors the enormous music-fandom presence on dedicated fic archives.

The Westeros effect and other patterns

Look closely and a hidden giant appears. Westeros shows up under three separate banners: A Song of Ice and Fire (the books), Game of Thrones, and House of the Dragon. Add them together and you get 42 works, which would place the franchise nearly level with Harry Potter at the very top. Fans clearly treat the book canon, the original show, and the prequel as distinct creative sandboxes, but the underlying world is one of the most-written settings in the entire dataset.

A few other patterns stand out:

• Games are rising. Genshin Impact and Blue Archive both crack the top 15, evidence that gacha and live-service games now generate fandom energy on par with prestige TV.
• The classics endure. Twilight and Harry Potter are both well over a decade old and still command huge fic interest, including from writers who were not born when the originals launched.
• The long tail is the real story. With 1,179 fandoms across 2,210 works, the average fandom has fewer than two fics. People are using AI to write for universes that would never appear on a "most popular" list, which is the whole point of fan creativity.

Why fanfiction writers are turning to AI

The shape of this data says something about the kind of writer behind it. Fanfiction is rarely a one-chapter affair. The works that define a fandom are the long, slow-burn epics that run for thirty, fifty, sometimes a hundred chapters, and those are exactly the projects where most people stall. You start with a clear idea for the first few chapters, and then the middle sags, the timeline slips, and a story that mattered to you ends up abandoned in a drafts folder. An AI fanfiction writer that drafts a full chapter from your outline is most useful precisely at that midpoint, when momentum usually dies.

The other reason is range. The same writer who wants a 60,000-word My Hero Academia epic this month might want a short, fluffy coffee-shop AU next week, or a dark angst one-shot the week after. A tool that only does one register forces them to fight it. Because the dataset shows people moving freely between heavy anime arcs, romance-driven pairings, and prestige-TV drama, flexibility matters more than raw prose polish. That is why many fic writers treat AI as a drafting partner across formats: a long fic in the AI novel writer, a quick scene in the AI short story writer, and a relationship-led plot in the AI romance writer, all from the same project.

Cost is the third factor, and it is not a small one. Fanfiction is a gift economy: nobody is getting paid, so a writer is not going to spend a subscription's worth of money to draft a hobby fic. The presence of so many works across so many small fandoms suggests people are reaching for tools they can use without commitment, which is why a genuinely usable free AI book writer tends to win this audience over a paywalled one. If you are weighing options, our roundup of the best free AI book writing tools covers what each one actually lets you do before asking for a card.

Best AI tools for writing fanfiction

Not every AI tool handles fic the same way. The two things that matter most are character-voice consistency and long-form continuity, because fic readers notice the moment a beloved character sounds wrong or a plot thread is dropped. Here is how the main options compare.

For the long, canon-heavy arcs that dominate this dataset, a dedicated AI fanfiction writer with chapter structure beats a general chat tool. For a deeper hands-on comparison, see our test of 5 AI tools on real fics.

How to write fanfiction with AI

1. Set your canon up front. Give the tool the characters, relationships, setting rules, and timeline. A few lines of canon detail prevent most out-of-character drift.
2. Add voice samples. Paste two or three real lines of dialogue per major character so the AI matches speech patterns instead of defaulting to generic prose.
3. Outline by chapter. Fic lives on structure. A chapter outline lets the AI carry plot threads forward instead of forgetting them mid-story, and an AI chapter generator can draft each one from that outline.
4. Generate, then edit for voice. Use the AI for the first draft and tighten the character-specific tics it misses. The best fics are still human-edited.
5. Export and share. Download to PDF or EPUB for offline reading, or format for your archive of choice.

You can start a fic for free with the free AI book writer, or jump straight into the fanfiction writer and set your fandom in the project brief.

Methodology

We analysed more than 47,000 books created with Inkfluence AI and isolated the 2,210 projects that named an existing universe as their source. Fandom names were normalised by merging author suffixes and obvious variant spellings (for example, "Harry Potter (J.K. Rowling)" and "Harry Potter" count as one). Counts reflect distinct projects, not chapters or words. Figures are a snapshot from June 2026 and will shift as more books are written. This is aggregate data only: no private content, account details, or personal information is included, and we do not publish anything that identifies an individual writer or their work.

Frequently asked questions

What is the most written fandom for AI fanfiction in 2026?

Harry Potter is the most-written fandom for AI fanfiction, with 141 works in our dataset of 2,210 AI fics, roughly 2.7 times the next fandom. It outranked every anime, comic, game, and TV franchise.

Which anime are most popular for AI fanfiction?

My Hero Academia, Naruto, Jujutsu Kaisen, and One Piece are the most-written anime fandoms, and together they take four of the top five overall positions. Anime is the largest single category once titles are grouped.

How many fandoms do AI fanfiction writers cover?

Our dataset of 2,210 AI fanfiction projects spanned 1,179 distinct fandoms. Most fandoms had only one or two works, which shows people use AI for niche universes, not just the famous ones.

What percentage of AI books are fanfiction?

About 4.7% of all books written on Inkfluence AI were fanfiction set in an existing universe. Original fiction and non-fiction make up the large majority of AI book creation.

Is Game of Thrones popular for AI fanfiction?

Yes. When you combine A Song of Ice and Fire, Game of Thrones, and House of the Dragon, the Westeros universe reaches 42 works, nearly matching Harry Potter at the top. Fans treat the books, the show, and the prequel as separate canons.

Can AI write good fanfiction?

AI can write strong first drafts of fanfiction, especially plot structure and dialogue. It works best as a co-writing tool: you supply canon knowledge and creative direction, the AI handles prose, and you edit for voice. Tools with chapter structure, like a dedicated AI novel writer, hold character consistency far better across long fics than a general chat assistant. Our hands-on test of 5 fanfiction tools shows the gap clearly.

What is the best AI for writing long, multi-chapter fanfiction?

For long fics, a chapter-aware tool like Inkfluence AI maintains continuity across tens of thousands of words and exports to PDF and EPUB. General chat tools tend to lose character details after a few thousand words.

Is it legal to write AI fanfiction?

Fanfiction itself sits in a long-standing grey area of fan use, and adding AI does not change the underlying copyright questions. Keep fics non-commercial, follow the rules of the platform where you publish, and be transparent about AI assistance where community norms expect it.

Can I publish AI fanfiction on AO3?

Archive of Our Own does not currently ban AI-assisted content, though community norms around disclosure are evolving. Being open about AI assistance builds trust with readers. Always follow the current terms of the archive you post to.

Does AI fanfiction respect canon?

Only if you feed it canon. AI has no built-in knowledge of every universe, so the quality of your character and world setup determines how canon-compliant the output is. Detailed briefs plus human editing produce the most faithful results.

Can AI write crossover fanfiction?

Yes. Because you define the canon in your brief, you can describe two universes and the rules for how they meet, and the AI fanfiction writer will work within that combined setting. Crossovers actually play to the strength of a brief-driven tool, since nothing is hard-coded about which characters can appear together. For quick one-shot crossovers, the AI short story writer is a faster starting point.

How do I stop AI fanfiction from sounding generic?

Generic output almost always comes from a thin brief. Add specific dialogue samples, relationship dynamics, and tone notes (angst, crack, slow burn), then edit the draft to restore the verbal tics that make a character recognisable. The setup work is what separates a flat fic from one that sounds in character, and it is the same craft that goes into avoiding generic AI book output in any genre.

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