We all know Shining Armor. But we don't know Katyla, or Solar Shadow. Katyla Sparkle has a need in her. A need for power. And she finds that need when she meets the most despicable pony in Equestria: King Sombra.
He's one kind of person, you're another. When life is going along normally, you're almost the same. But when life turns strange, suddenly, you're different people entirely.