Sunset Shimmer is a Unicorn and the main antagonist of the My Little Pony: Equestria Girls film. Not long before Twilight Sparkle, she was a student of Princess Celestia, but due to becoming cruel and dishonest for not getting what she wanted, she abandoned her studies to pursue her own path, and then she traveled to the human world using the crystal mirror when it was still on Canterlot, for some time she became a student at Canterlot High School. In the beginning of the film, she steals Twilight's element of magic while she sleeps, Sunset trips with Spike's tail, making her awake and notices Sunset stealing her crown, then she chases Sunset to get her crown back, while on the tussle, the crown is thrown to the crystal mirror to to the human world, Sunset then goes to the portal following the crown.
Sunset Shimmer is considered a non-canon character in the Friendship is Magic series, as her only appearances are in the Equestria Girls movies and in one of the IDW comics.
In M.U.G.E.N, Sunset Shimmer was made by The MegaBrony, under the name of Headmaster Thomas Light.
The MegaBrony's version
As with The MegaBrony's other ponies, Sunset Shimmer is a MegaMan X-styled character. She uses a fire-oriented moveset and can do Sonic's spin dash. She also uses Botchan-MLP's Sunset Shimmer's desktop ponies sprites and edited ones and also has a brutal AI like his other characters.
Hovering the mouse cursor over the icons will display a more direct activation method akin to how the move activations are coded; this is what the following key/legend represents.
CVS. Sunset Shimmer ToonAlexSora007 W.I.P. %99