Twilight Sparkle is the central main character of My Little Pony Friendship is Magic. She is a female unicorn pony who transforms into an Alicorn and becomes a princess in Magical Mystery Cure. She is also the daughter of Twilight Velvet and Night Light, the younger sister of Shining Armor, sister-in-law to Princess Cadance, and paternal aunt to Flurry Heart.
King Sombra, or simply Sombra, is a male initially-umbrum unicorn, the former tyrannical ruler of the Crystal Empire, and the main antagonist of the season three premiere, the season nine premiere, and the IDW comics’ thirteenth story arc and My Little Pony/Transformers II. Princess Celestia tells Twilight Sparkle that he took over the Crystal Empire a thousand years ago but was banished into the frozen north. Before his banishment, King Sombra put a curse on the Crystal Empire which made it vanish into thin air. When the Empire returns, so does Sombra, who attempts to retake it. He is defeated by Spike, Princess Cadance, and the Crystal Ponie