Of course you have your "user groups".
These are great but are not what I'm after.
What I'm interested in are different flairs per category.
Say you have a Formula 1 node (board). In this board you want Formula 1 driver names to be available flairs (Lewis Hamiltion, Sebastian Vettel, Charles Leclerc,..).
A user could somewhere within that node select his/her flair. The flair would then be visible below the user's avatar only within that specific node.
Xenforo simulation:

Reddit example:

In my opinion this helps different nodes have different identities.
Say you have a GTA V discussion node: why not have flairs available like "Lamar" "Michael", "Trevor",..
Of course all flairs should be customizable with css in the admin backend.