The Most Popular Fandoms for AI Fan Fiction

The top 15 fandoms people write AI fan fiction about

Here is the ranking, by number of fan fiction books made with Inkfluence AI, after merging name variants (so "Naruto" and "Naruto (Masashi Kishimoto)" count together):

Beyond the top 15, the Inkfluence AI data keeps going through Game of Thrones, The Boys, Teen Wolf, House of the Dragon, Batman, Stranger Things, Fourth Wing, Demon Slayer, Attack on Titan, and hundreds more, all the way down to single-book fandoms.

Why is Harry Potter the runaway #1?

On Inkfluence AI, Harry Potter is not just first, it is first by a distance: 87 books, roughly three times the next fandom. That mirrors the wider fan fiction world, where Harry Potter has long been one of the largest single communities on archives like Archive of Our Own. The reasons are structural. It has a deep, richly mapped world with dozens of named characters and locations, a fanbase that has been writing for over two decades, and an enormous canon of established tropes for new writers to build on. When someone reaches for an AI tool to write fan fiction, the universe with the most existing scaffolding is the easiest place to start, and Harry Potter has more scaffolding than anything else.

Why does anime dominate everything after it?

Three of the next four fandoms are shonen anime: Naruto (29), Jujutsu Kaisen (28), and My Hero Academia (26), with One Piece, Demon Slayer, and Attack on Titan close behind. Anime fandoms are huge, young, intensely online, and built around large casts and open-ended worlds, exactly the conditions that produce a lot of fan fiction. They also skew toward the demographics most comfortable experimenting with AI writing tools. Add games with anime-style worlds like Genshin Impact (13) and Fate/Grand Order, and anime-adjacent stories make up the single largest slice of AI fan fiction after Harry Potter. If you write in this space, Inkfluence AI keeps a big cast and their voices consistent across chapters, which is usually the hardest part.

It is not just books and anime: TV, games, and K-pop

The data spans every kind of media. TV is strong, with The Vampire Diaries (14), Stranger Things, Teen Wolf, House of the Dragon, Supernatural, and The Boys all featuring. Games show up through Genshin Impact, Fate/Grand Order, and even the horror game Poppy Playtime. And music fandom is real: on Inkfluence AI, BTS sits in the top 10 with 13 books, a reminder that K-pop "real person" fan fiction is a major category. Book series remain a backbone too, from Percy Jackson and A Song of Ice and Fire to the newer Fourth Wing, which already has its own AI fan fiction within a couple of years of release.

How common is fan fiction among AI books?

About 4.3% of all 33,549 books created with Inkfluence AI are fan fiction set in an existing universe. That makes it a passionate niche rather than the main use of AI for books, which is led by practical non-fiction and original fiction (see what people write with AI). But the 832 distinct fandoms tell the more interesting story: fan fiction has an enormous long tail. For every Harry Potter with dozens of books, there are hundreds of universes with just one or two, from indie games to childrens cartoons to a single beloved novel.

The surprising fandoms in the long tail

The most fun part of the 832 fandoms on Inkfluence AI is what shows up that you would not predict. Poppy Playtime, a horror video game, has more AI fan fiction than some blockbuster films. Steven Universe and Avatar: The Last Airbender prove animated series travel well. Fate/Grand Order shows how deep gacha-game lore runs. And BTS ranking above most movie franchises is a clear signal that "real person fiction" from music fandoms is one of the quiet giants of the genre. The long tail is where fandom gets weird, personal, and genuinely creative, which is exactly why people love it.

Can you write and sell AI fan fiction?

You can absolutely write it. Non-commercial, transformative fan fiction shared freely is the basis of the huge communities above, and Inkfluence AI makes it faster to draft a multi-chapter story in any of these worlds. Selling it is the line to be careful about: the characters and worlds are copyrighted, so fan fiction lives in a legal grey area and selling work built on someone elses universe can infringe their rights. The practical takeaway from our wider data is that if your goal is to publish and earn, original fiction is the safer path, and it is just as quick to write with AI. Many writers use fan fiction to practise, then carry the skills into original worlds they fully own.

Methodology

This study is based on all 33,549 books created with Inkfluence AI as of June 2026. When a book is set in an established universe, that universe is recorded on the book. We counted those records (1,427 books carried one), normalized name variants by stripping author and creator suffixes (so "Harry Potter" and "Harry Potter (J.K. Rowling)" merge), and ranked the totals. Counts are exact; the fan fiction share is rounded. Live totals grow daily.

Sources

• Inkfluence AI first-party data: 1,427 fan fiction books across 832 fandoms, of 33,549 total books (June 2026).
• Archive of Our Own (AO3), the largest fan fiction archive, where Harry Potter and major anime are consistently among the most-written fandoms.
• Fanlore: Fan fiction, background on fan fiction as a transformative, largely non-commercial practice.