Well, for one, imagine taking the actual Power Ponies(instead of the mane six dressed as them) from their official comic(it's one of the annuals in the Other section here: yp1.yayponies.no/book.php ) and make them lose their powers. What would their secret identity names be? What would their special talents be? And their personalities? From what I've seen though, I think the wingless Masked Matterhorn's horn is an artificial creation.