Aria Blaze is a siren and one of the secondary antagonists in My Little Pony Equestria Girls: Rainbow Rocks. She is backup singer in her band The Dazzlings, rivals of the Rainbooms.
Role in the film
In the film, Aria and the other Dazzlings are introduced in the human world. They are sirens from Equestria who were banished to the human world by Star Swirl the Bearded. They are first seen in a café causing tension between the patrons, and Aria grumbles about the world's lack of satiating magic. Later, when Sunset gives a school tour to Aria and company and mentions the musical showcase, Aria forebodingly states that they sing "from time to time". She and the Dazzlings later convince the students with their music to turn the friendly Mane Event into a Battle of the Bands.
Aria and the Dazzlings use their siren's songs to control student opinion and advance through the competition bracket.
In the final battle against the Rainbooms, Aria and the Dazzlings are eventually defeated and the gem pendants with which they controlled the students are destroyed. As a result, their inability to sing leads to them being chased off in disgrace.
Throughout the film, She is shown to be just as cold and manipulative as her leader Adagio Dazzle, convincing Trixie into removing the Rainbooms from the competition. She also frequently butts heads with Sonata Dusk, occasionally calling her "the worst" and arguing with her over trivial matters.
Aside from flashbacks, Aria's true form is never physically shown in the film, but she and her fellow band members gain pony-like ears, extended ponytails, and translucent wings. They also summon astral projections of their true siren forms from their pendants.