Chanted Star is a homeless mare currently residing in Ponyville. Well, was, anyway. After a festival Luna invites her to Canterlot, and adopts her as her protege, similarly to how Twilight is Celestia's protege.
Of course, Chanted's magic is incredibly unstable, and she isn't nearly as interested in books as Twilight, so things go less than smoothly.

Over 2000 years ago those who believed in Princess Luna were banished alongside the Princess of the Night, and the rest became the Solar Conglomerate. Those who were forced off the planet became the Lunar Exodus. Now, the soldiers of the Lunar Marines have a slim chance at reclaiming the one thing they have fought so hard to reclaim-Home.

The Vanguard of Hell. Humanity's mightiest military as of 3182 Third Age (BC, or Second Age, ended in 6047 BC, and the year after was 1 Third Age, for reference). Their massive ships and their powerful, armored Vanguard Marines prove more than a sturdy defense against the alien hordes that want nothing more than to destroy us. When a Vanguard Mega-Cruiser, the VONS Ram Of Your Gates, crash lands on Equestria, drawing the attention of the hostile S'riiv'ya Empire, the confused human soldiers and the even more confused pony residents must learn to work side by side if either are to make it out alive.
Also, what the Vanguard Marines look like:
http://snowy-aegis.deviantart.com/art/Vanguard-435854388

When Twilight is transported to the mysterious second moon of Maarven, she and her new friend must fight the evils of Maarven to save it from the selfish tyrant king.

A Mecha-Pegasus called X-55 is banished from his underground home of Magnafell, with his banishment disguised as 'research'. On the surface of Equestria X gets more than he bargained for, including pony society, 'friendship' and responsibilities, and even an impending war...

This is part 1 of a trilogy I am making about X, and involves him trying to fit in with pony society.

Next Chapter, Chapter 11, About The Thing, the ponies head once again to Canterlot to explain to Celestia what happened, and X tries to find the elusive pony watching him.