*Adagio Dazzle is a female human and siren. She is a student from Canterlot High School and is the main antagonist of My Little Pony Equestria Girls: Rainbow Rocks. Adagio Dazzle is one of the three Dazzlings, alongside Sonata Dusk and Aria Blaze. The de-facto leader of the operation, Adagio is often front-and-center, leading on her two fellow Dazzlings wherever they may go. Despite being the leader, she isn't always in control of her group, often being at loggerheads with her fellow Sirens. A cruel and manipulative individual, Adagio is without any sense of morals and will do anything to grow more powerful.

Throughout Rainbow Rocks, Adagio Dazzle is shown to be scheming, manipulative, and only concerned with being adored by others. Using her dark magic, she is able to sway the students' opinion with ease and trick Trixie into removing the Rainbooms from the competition. She also displays a degree of sadism, seen when taking advantage of Sunset Shimmer's insecurities, and a considerable level of intelligence, as she quickly recognizes the Rainbooms as a source of magic. Adagio bears contempt toward her fellow sirens Aria and Sonata, calling them "idiots" and generally disliking their company. She also appears to show contempt toward her fans, calling them “human scum” under her breath.

As a human, she is a tall teenage girl with dull purple long-sleeved hoodie, grayish-blue jeans, and white sneakers. She also has pale apple green skin, brilliant raspberry eyes, and luminous vivid orange hair with brilliant yellow streaks wrapped in a ponytail with a violet spiky ponytail holder.

Upon arriving at Canterlot High, Adagio wears yellow eyeshadow, a dark purple ponytail holder with short gold spikes, a mauve violet mini bolero with small shoulder puffs over a purple romper that stop slightly above the thighs and her cutie mark (an indigo music note with a gold gem) on the bottoms, a golden, spiky belt with a yellow gem around her waist, lavender tights with lilac triangle imprints, and dark purple below-the-knee boots with yellow gold-spiked bands around the ankles and gold-spikes on the brown medium heels.*