Original characters and worldbuilding can feel hollow when you only have a bullet list of traits. Headcanons—those small, specific details that never make it into the “official” bio—are what make OCs feel like real people and worlds feel lived-in.
Start with one character
Before you build the whole cast, run your protagonist through the Character Headcanon Generator. Ask for habits, irrational fears, or “how they react when they’re tired.” Save a few results that fit. Those details become the seeds for scenes: the way they hold a cup, the song they hum when stressed, the one food they refuse to eat. You’ll find this tool and the rest on the AI Headcanon Generator homepage.
Then add the relationships
Once you have 2–3 key characters, use the Relationship Headcanon Generator for the pairs that matter—rivals, allies, found family. You’ll get micro-rituals and tensions that feel unique to those people, not generic “best friends” or “enemies.” Drop one or two into your world doc so you know how they act when they’re in a room together.
Use random and quotes for tone
For a quick dose of “what would they do in a weird situation?” try the Random Headcanon Generator. For dialogue and voice, the Incorrect Quotes Generator can help you test how your OCs sound when they talk. Both are linked from the homepage so you can switch between all four tools without hunting for URLs.
If you’re building OCs or a new world, start from the AI Headcanon Generator and use the generators as a lab—then weave the best bits into your worldbuilding doc and drafts.