If you are able to get out both twins (even in another deck in a big Fellowship) Elrohir can really help a Spirit deck by being a surprisingly good defender (and also being able to quest when there a lots of Orcs around, which is quite often in this game).
Ally. Cost: 3. 2 1 1 3
While Elladan is in play, Elrohir gets +2 .
"From the North we came with this purpose, and from Elrond our father we brought this very counsel." The Return of the King
The Mountain of Fire #8. Spirit.