Whirlybird
It’s a shame Twi and Luna couldn’t get an episode together. Twilight seems like the perfect pony to befrind her; She knows all about ancient history, stays up late at night studying, and likes astronomy and stargazing and her tower in Canterlot was blue with stars decorating the roof. I would think Luna would have been curious about the only pony to remember her in her thousand-year absence, save for Celestia.