Glossary

Headcanon — definition and meaning

A headcanon is a personal belief about a fictional character or story that isn't confirmed by the official source but feels true to the fan who holds it.

Last reviewed 2026-05-25

Headcanon is the fan's private addition to a fictional world — a backstory detail, a personality trait, a relationship — that isn't 'canon' (officially established) but shapes how that fan experiences the character. In AI companions, headcanon becomes literal: the persona you build and the history you accumulate with it are your canon, editable and yours. Bae's memory canon is a deliberate nod to this — the relationship's facts are a record you can see and revise, not a hidden state the platform controls.

Common questions

About headcanon.

What is headcanon?

A headcanon is a personal belief about a fictional character or story that isn't confirmed by the official source but feels true to the fan who holds it.

How is "headcanon" used in AI companion apps?

Headcanon is the fan's private addition to a fictional world — a backstory detail, a personality trait, a relationship — that isn't 'canon' (officially established) but shapes how that fan experiences the character. In AI companions, headcanon becomes literal: the persona you build and the history you accumulate with it are your canon, editable and yours. Bae's memory canon is a deliberate nod to this — the relationship's facts are a record you can see and revise, not a hidden state the platform controls.

What other terms relate to headcanon?

Related terms in the AI companion space include: Shipping (fandom), Memory canon, Character card. Each has its own glossary entry on /glossary.