So this isn't a conversation about labelling a relationship (which is important for many) or labelling your sexuality/gender identity (which can give people a sense of validity) or even labelling your professional life (teacher/firefighter/etc.). This is about more... trivial labels for identifying oneself.

Hogwarts Houses

Divergent Factions

Hunger Games Districts

Meyers-Briggs

Alignment Chart (Chaotic Good, etc.)

Zodiac Signs

There's more, but I'll leave it there. Meyers-Briggs has been called into question for scientific reasons, but I still come across it being used as part of training exercises.

Just looking for thoughts - can be as in depth or vague as you like.