Sonata Dusk

Sonata Dusk is a female character and one of the main antagonists in My Little Pony Equestria Girls: Rainbow Rocks. She is backup singer in her band The Dazzlings, rivaling the Rainbooms.

Role in the Film
The Dazzlings, including Adagio Dazzle, Sonata Dusk, and Aria Blaze, appear in My Little Pony Equestria Girls: Rainbow Rocks as the main antagonists.

In the film, Sonata 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 Sonata briefly argues with Aria Blaze. She and the Dazzlings later convince the students with their music to turn the friendly Mane Event into a Battle of the Bands.

Sonata 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, Sonata 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.

Personality
Throughout the film, she is shown to be somewhat air-headed and carefree. She doesn't pick up on Adagio's sarcasm when she says she "loves" the human world, and she speaks candidly with Sunset Shimmer about her and her friends' true nature, nearly blowing their cover. In addition, she frequently argues with Aria Blaze over trivial matters. Despite this, she shows at least some level of cruelty, as she appears to take pleasure in belittling Sunset.

Apreance
Aside from flashbacks, Sonata'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.