Aria Blaze appears alongside Adagio Dazzle and Sonata Dusk in My Little Pony Equestria Girls: Rainbow Rocks as the main antagonists.In the film, Aria and the other Dazzlings are introduced in the human world.
Aria Blaze is a member of the trouble-making band, the Dazzlings.
Even though Aria doesn't play nice on stage, she still has a rockin' sense of style. Aria Blaze is portrayed as being more level-headed than her companion Sonata Dusk and often speaks in a rather bored disposition.
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 fin-like wings.
They also summon astral projections of their true siren forms from their pendants.
Aria is also the only member of the Dazzlings who is not referred to by name in the film, although Sonata refers to her by name in the novelization.
A drawing of Aria's siren form is briefly seen in My Little Pony Equestria Girls: Friendship Games during the CHS Rally Song.
They are sirens from Equestria who were banished to the human world by Star Swirl the Bearded to keep them from using their dark magic to conquer Equestria.
They are first seen in a café causing tension between the patrons, and Aria grumbles about the world's lack of satiating magic.
and see her tell Twilight to her muzzle why she came to be the way she is.
I'll say right now, as we've been asked constantly- it has nothing to do with any fan-theories out there.
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 and joining Adagio in undermining Sunset Shimmer's confidence.