Elven Sects

Another way of recasting different groups of elves I've thought about is to draw inspiration from the wuxia tradition with its various kung-fu sects/schools/cults. Wikipedia has a nice (though I'm sure incomplete) list by author of these.

Though, I'm not opposed to kung-fu elves, mind you, perhaps in the case of elves, these would be based around a particular school or style of magic? They could be based on the elements or maybe the Classical Planets. They would presumably each be centered in a particular locale, probably remote from wider civilization.

Using this approach, different types of elves would have less physical or temperamental differences, but perhaps more philosophical ones. There might be rivalries between them. Since it's not an ethnicity but an allegiance, elves could move from one to the other, though perhaps not without some penalty.

I think this approach also has the benefit of making elven subtypes less background and more factions to interact with in gameplay.