Luna isn't comparable to the mane 6, she is Zecora-level. One episode centered around her, and then just cameos later. She doesn't need their level of characterization.
Still, she is unique because she is 1000 years removed from the present so that's a different kind of awkward than the other awkwards in the show.
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_foolmo_
'It's easy to get yourself in trouble if you start quoting people who don't like you in your signature' - Mods