Sometimes you know you want to write a headcanon, but you're not sure where to start. These 50 headcanon ideas and prompts span different character types, relationship dynamics, and emotional registers. Use them as starting points and make them your own.
Character headcanon ideas
1. A secret hobby nobody would expect from this character.
2. Something they collect without telling anyone.
3. A recurring nightmare they've never described to anyone.
4. Their comfort food and the memory attached to it.
5. A small physical habit they have when nervous.
6. Something they're secretly better at than they let on.
7. A childhood fear they never fully grew out of.
8. The song they play when they need to feel like themselves again.
9. How they act when they think no one is watching.
10. A promise they made to themselves they've never told anyone about.
Relationship headcanon ideas
11. A small ritual two characters share that started by accident.
12. The thing one character does that the other secretly finds endearing.
13. An argument they had that changed something between them.
14. How they show care without saying it out loud.
15. Something they both pretend not to notice about each other.
16. A running joke only they understand.
17. How they would comfort each other after a loss.
18. The moment one of them realized they trusted the other completely.
19. Something one taught the other that the other still uses.
20. Their dynamic when one of them is sick.
Scenario headcanon ideas
21. How this character handles a power outage.
22. What they do on a rare day with nothing to accomplish.
23. How they behave in a waiting room.
24. Their reaction to getting completely lost somewhere.
25. What they're like as a houseguest.
26. How they handle being recognized by a stranger.
27. Their relationship with mornings.
28. What they do when they can't sleep.
29. How they act at a party where they don't know anyone.
30. Their approach to gift-giving.
Backstory headcanon ideas
31. Something that happened to them before the story started that still shapes them.
32. A person from their past they still think about.
33. Something they wanted to be when they were young.
34. The moment they stopped trusting easily.
35. A kindness someone showed them they've never forgotten.
36. Something they had to unlearn.
37. A decision they've never forgiven themselves for.
38. The first time they felt genuinely proud of themselves.
39. Something about their family they've never talked about.
40. A place that still feels like home.
Incorrect quotes headcanon ideas
41. A character explaining something completely wrong with total confidence.
42. Two characters having an argument about something completely trivial.
43. A character asking for help with something they definitely should know how to do.
44. Someone accidentally revealing a secret in the least dramatic way possible.
45. A character's reaction to modern technology or slang.
46. Two characters bonding over something they both pretend to hate.
47. A character being completely unaware they're being threatening.
48. Someone trying to explain their feelings and completely failing.
49. A group chat dynamic that makes total sense once you see it.
50. A character giving advice that is technically correct but completely unhelpful.
Ready to generate?
Pick any of these prompts, choose your character and fandom, and let your imagination run. Or use our AI headcanon generator to bring these ideas to life instantly — just enter your character's name and let the generator do the heavy lifting.