5+ Best AI Fan Fiction Writers of 2025

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In this post I will show you what are the best AI fan fiction writing tools.

This guide focuses on what actually helps you plan, draft, and polish stories set in the worlds you love. It also gives practical workflows you can use today.

I write in clear, simple language. No fancy terms. No filler. No marketing fluff. You want tools that work and steps you can follow. Let’s begin.

What matters for fan fiction

Before we talk about tools, let’s be clear about what fan fiction writers need.

1. Canon awareness
You must keep facts straight: names, places, powers, timelines, ships. Some tools let you store facts in a side panel. Others let you feed notes to the model as you write. The more control you have over this, the better.

2. Character voice
Readers care about voice. They want their favorite characters to sound right. A good tool helps you hold tone and speech patterns steady through long scenes.

3. Long memory
Fan fiction chapters can be long. Series can stretch to novels. You need a setup that keeps track of what happened before. Tools with a lore panel or memory field help.

4. Scene-level control
You want to decide viewpoint, set beats, and keep the story from wandering. Tools that let you guide structure and rewrite easily give you that control.

5. Revision help
When the draft is done, you need help with clarity, pacing, and dialogue. Some tools highlight weak spots and suggest quick fixes.

6. Privacy and portability
Your words belong to you. Choose tools that let you export your text and move it to AO3, Wattpad, or anywhere else you publish.

Quick picks by use case

Here’s a short list if you want to jump right in:

  • Sudowrite: Best for planning, idea expansion, and structured drafting.
  • NovelAI: Best for lore control and long-form drafting.
  • AI Dungeon: Best for playful discovery writing and inspiration.
  • Character.AI: Best for roleplay-style voice testing and dialogue work.
  • KoboldAI: Best for local or customizable writing with deep control.
  • ProWritingAid: Best for editing, pacing, and style improvement.
  • Plottr: Best for outlining and building story bibles.

Sudowrite: plan, draft, and iterate

Why it fits fanfic
Sudowrite’s Canvas view is excellent for plotting. You can store ideas, character notes, and themes in one place. It helps you explore twists, fix pacing, and generate new scene ideas. It also offers a fan fiction generator to spark starting points.

How to use it

  1. Create a Canvas.
  2. Make columns for Premise, Characters, Ships, Beats, and Problems.
  3. Use the idea tools to find fresh turns.
  4. Lock a chapter plan and draft right inside the Canvas.

Tips

  • Ask for variants on a scene to explore tone or tension.
  • Use rewrite tools to smooth key paragraphs.

Best for: plot-driven fics and ensemble casts.

NovelAI: anchor lore and write long chapters

Why it fits fanfic
NovelAI was built for long-form stories. It has a Memory field for running context, an Author’s Note for tone and rules, and a Lorebook for canon facts and OC profiles. These tools help the story stay true to your world while you write.

How to use it

  1. Create a new story.
  2. Open Story Settings and pick a genre preset.
  3. Fill the Memory with a short summary of the premise and current arc.
  4. Add an Author’s Note with tone, ship, and rules.
  5. Build Lorebook entries for key characters and places.

Tips

  • Keep Memory focused and current.
  • Use Author’s Note for tone only.
  • Store canon in the Lorebook, not the draft text.

Best for: long chapters, canon-heavy worlds, and recurring side characters.

AI Dungeon: discovery writing and spark hunting

Why it fits fanfic
AI Dungeon is an interactive text adventure. It’s not for polished drafts but great for brainstorming and playing with scenes. You can write through fights, arguments, or alternate endings, then pull the good bits into your fic.

How to use it

  1. Start a custom story with your fandom premise.
  2. Write clear rules in the opening description.
  3. Play through key scenes and capture good lines.
  4. Rewrite those lines into your real draft.

Best for: fight scenes, banter, and creative warm-ups.

Character.AI: voice rehearsal through roleplay

Why it fits fanfic
Character.AI lets you chat with characters and test how they might respond. It helps you capture tone, humor, and rhythm. Use it for research and voice training, not full writing.

How to use it

  1. Find or create a character profile.
  2. Set the scene in the first message.
  3. Keep replies concise.
  4. Save strong exchanges and adapt them into prose.

Best for: dialogue practice and keeping voices authentic.

KoboldAI: flexible and customizable

Why it fits fanfic
KoboldAI gives you full control over how text is generated. It runs in your browser, connects to different models, and lets you adjust temperature, penalties, and memory settings.

How to use it

  1. Launch it in your browser.
  2. Choose a model.
  3. Add a short story summary in memory.
  4. Tune repetition and creativity settings.
  5. Draft in small chunks.

Best for: writers who like to experiment with structure and fine-tuning.

Plottr: outline, timeline, and series bible

Why it fits fanfic
Plottr helps you map timelines, arcs, and relationships. It’s visual and easy to adjust. You can track canon timelines and mark where your story diverges from them.

How to use it

  1. Build a canon timeline.
  2. Add an alternate line for your AU events.
  3. Create cards for main characters and ships.
  4. Export your plan to your drafting tool.

Best for: long series, crossovers, and stories with complex continuity.

ProWritingAid: fast editing and polish

Why it fits fanfic
After drafting, you need an editing pass. ProWritingAid highlights slow pacing, repeated phrasing, and clunky dialogue. It helps you tighten without changing your tone.

How to use it

  1. Paste your chapter in.
  2. Run the Pacing report and fix slow parts.
  3. Use the Dialogue report to trim heavy tags.
  4. Use the Style report for clarity.

Best for: line editing and final polish.

Three complete fanfic workflows

Workflow A: Canon-tight long fic
Use Plottr to map your outline. Write in NovelAI with a filled Memory and Lorebook. Finish each chapter with a ProWritingAid pass.

Workflow B: Idea to one-shot
Chat in Character.AI to find voice. Plan in Sudowrite Canvas. Edit the finished piece in ProWritingAid.

Workflow C: Discovery to structure
Play scenes in AI Dungeon. Draft refined ones in KoboldAI. Organize the plot in Plottr.

Keeping canon consistent

  1. One page per character: name, traits, secrets, and quotes.
  2. One page per location: look, purpose, and two sensory details.
  3. Keep a running log after each chapter.
  4. Make a short “no-go” list for tone and rules.

Strong dialogue workflow

  1. Roleplay a short chat to hear the rhythm.
  2. Rewrite in your own words.
  3. Use editing tools to trim fluff.
  4. Keep a mini style sheet for each voice.

Smarter outlines

  • In Plottr, plan only big beats, not every scene.
  • In Sudowrite Canvas, keep a “Problems” column to spark ideas.
  • In NovelAI, reserve Memory for relevant context only.

Clean editing routine

  1. Read aloud once.
  2. Run pacing checks.
  3. Polish dialogue and style.
    That’s enough to get a clean, readable chapter.

Privacy and posting

  • Export your text often.
  • Keep backups offline.
  • Copy only what you want shared.
  • Track story facts in one central file.

Common mistakes

Canon drift: Move key facts into a lore system.
Flat voices: Warm up with short roleplays.
Bloated scenes: Write one-sentence goals per scene.
Slow pacing: Alternate dialogue and action.
Too many tools: Use one for planning, one for drafting, one for editing.

Example starter kits

Basic stack: NovelAI + Plottr + ProWritingAid
Idea stack: Sudowrite + Character.AI + ProWritingAid
Tinker stack: AI Dungeon + KoboldAI + Plottr

Prompt formulas

Scene recipe:

  • Goal
  • Stakes
  • Two setting details
  • 400–600 words ending on a change

Reaction recipe:

  • What happened
  • How they feel
  • Object that mirrors mood
  • 250–400 words introspection

Banter recipe:

  • Two characters
  • Topic and tension
  • Limit to five exchanges

How to bend canon safely

  1. Mark your divergence early.
  2. Keep actions in character.
  3. Change one rule, track its effects.
  4. Color-code AU notes in your lore or outline.

Writing romance and emotion

  1. Set up chemistry with three moments.
  2. Add a clear obstacle.
  3. Show risk and confession.
  4. End with a choice that proves growth.
    Keep emotion grounded. Use sensory detail and restraint.

Fight scenes that stay readable

  • Anchor with clear space details.
  • Keep actions short.
  • Track damage and momentum.
  • Trim long inner thoughts.

Posting rhythm and reader trust

  • Draft two chapters before posting.
  • End each chapter on a question or beat change.
  • Keep a recap page with plot and ships.

Tool summary

NovelAI: For long stories and canon accuracy.
Sudowrite: For plotting and expansion.
AI Dungeon: For playful discovery.
Character.AI: For testing character voices.
KoboldAI: For flexible drafting and control.
Plottr: For clear outlines and timelines.
ProWritingAid: For editing and polish.

Common questions

Is there one perfect tool?
No. Use a small stack: one planner, one writer, one editor.

Can I write only in roleplay tools?
You can, but structure will suffer. Use them for voice practice.

Do I need an outline?
Not if you hate them. Keep just a short timeline or beat list.

Can I edit in a doc?
Yes. Many writers draft in one tool and edit in another.

How do I avoid overusing AI?
Write first, generate only when stuck. Keep your style central.

Seven-day starter plan

Day 1: Pick your fandom and premise.
Day 2: Build a five-beat outline in Plottr.
Day 3: Set up NovelAI with Memory and Lorebook. Draft 800 words.
Day 4: Roleplay a dialogue to test tone.
Day 5: Draft a turning point scene.
Day 6: Edit in ProWritingAid for pacing and clarity.
Day 7: Post or share and log key facts.

Final thoughts

Good fan fiction blends respect for canon with your own ideas. The right tools make it easier to stay organized, keep characters consistent, and move faster without losing quality. You do not need everything. Pick one planner, one writer, and one editor.

If you want a clean start: plan in Plottr, draft in NovelAI or Sudowrite, and edit in ProWritingAid. That’s enough to go from idea to post while staying true to the story you want to tell.

For a looser, play-first approach, try AI Dungeon or Character.AI to find voices and sparks, then refine your draft in your main writing tool. If you like to tweak settings, KoboldAI gives you room to experiment.

Keep your lore organized, keep your process simple, and let your voice stay in control. That is how you use AI tools to write the fan fiction you want to read.