The fact that they eat people is where it starts and ends...
They don't act differently because of it (outside offering bodyparts as rewards).
Would be neat if the fact that they are just a ball of other people's memories kind of popped up a bit more.
Elves are depicted as serious minded no-nonsense folks... who wear whimsical armor and weapons... Who eat people in gorey fashion. (and no one really cares oddly enough)
Another thing that came to my mind on this is that they only speak in the Present Tense. Have they always been that way? If not, that's a neat little bit of flavor.