Nothing breaks immersion faster than a character who suddenly talks or thinks like someone else. Headcanons—especially ones that touch on voice and internal logic—help you keep dialogue and POV consistent across chapters.
Lock in internal voice first
Run each POV character through the Character Headcanon Generator. Ask for "internal monologue when stressed," "how they talk to themselves," or "phrases they overuse." Save a few and keep them in a doc. When you write their thoughts or dialogue, you’ll have a reference. You can access it from the AI Headcanon Generator homepage.
Use relationship dynamics for how they talk to each other
Two characters might have distinct voices alone but slip into "same voice" when together. The Relationship Headcanon Generator can suggest how they interact—who deflects with jokes, who goes quiet, who repeats the other’s words. One or two of those beats per pair will keep conversations from blending. Everything lives on the homepage.
Test lines with the quotes generator
When a line feels off, paste the vibe (or the scenario) into the Incorrect Quotes Generator. See what it gives for that character. You don’t have to use the output—use it as a "voice check." If the generator’s version feels more like them, adjust your line. The main site has all four tools in one place.
For consistent dialogue and voice across a long project, start on the AI Headcanon Generator homepage and build a small voice-and-dynamic reference before you write.