Curate, connect, and discover
I love headcanons as a concept because it is so silly to me that a person can look at some random character and just decide something about them.
You don’t even need evidence to back it up most of the time. It’s just vibes.
And everyone has their own little headcanons that we can trade around like Pokémon.
It’s especially great when a headcanon becomes so popular it’s basically accepted as canon.