Sunset Shimmer

Sunset Shimmer, is the former main antagonist turned secondary protagonist in Rainbow Rocks.

Rainbow Rocks (SPOILERS)
Sunset Shimmer re-appears in My Little Pony Equestria Girls: Rainbow Rocks, reformed from her villainous ways in the first film. With the exception of the Rainbooms, the rest of Canterlot High bears resentment toward her and she even resents herself for the actions she'd taken as what she refers to as a "raging she-demon". She even admits to herself and her friends that she only dated Flash Sentry to make herself more popular.

When Sunset gives the Dazzlings a tour of the school, she gets a bad vibe from them when Adagio Dazzle gets defensive about her pendant. Her suspicions are later confirmed when the Dazzlings mesmerize the students and faculty with their singing. Using a magical book with her cutie mark on the cover, Sunset sends an SOS to Twilight Sparkle in Equestria. During Twilight's role as the Rainbooms' lead singer, Sunset acts in a supportive role and keeps an eye on the competition, especially the Dazzlings during the Battle of the Bands.

When the Rainbooms lash out at each other during the final round of the Battle of the Bands, Sunset realizes the Dazzlings' true intentions and is able to stop the arguing. She even accepts partial blame due to her lack of knowledge on friendship.

When the Dazzlings overpower the Rainbooms during the film's climax, Sunset Shimmer steps up and sings on the band's behalf. Her help not only gives the Rainbooms the strength needed to defeat the Dazzlings, but she also undergoes a half-pony transformation like her friends. Afterward, Sunset joins the band as a singer and guitarist, and she uses her old journal that she communicated with Princess Celestia through to write her friendship reports to Princess Twilight Sparkle.

During the credits, Sunset is seen having now been accepted by the rest of the school, as the Cutie Mark Crusaders walk happily with her and Bulk Biceps helps her get Angel Bunny down from where he is stuck.

Sunset Shimmer is featured in the songs Welcome to the Show and Shine Like Rainbows during the film.