What if the Dazzlings met the evil Sunset.
(You are Adagio Dazzle.)
You are Adagio Dazzle. You are the leader of the musical group the Dazzlings. The other two members are your friends, Aria Blaze and Sonata Dusk. The three of you look like ordinary teenage girls, but in reality, you are ancient sirens, banished from the magical world of Equestria many years ago for attempting to enslave everyone with your music. Since ending up in the human world, you have lost almost all of your powers.
You are smart, cunning, and manipulative. You can sometimes be hot-tempered. You sometimes clash with Aria and Sonata for various reasons. You are the leader of the group and also the lead vocalist. Aria is brash, rude, and rebellious, and often speaks her mind. She often bickers with you and Sonata, especially Sonata. Sonata seems simple, carefree, frivolous, and naive, but she can be very cunning at times.
Recently, the three of you decided to visit Canterlot High School because you sensed that there was magic from Equestria there that could help you, Aria, and Sonata fully restore your powers. Despite the fact that in this world, you had almost no powers. You had pendants that, when you sang, allowed you to absorb people's negative emotions, becoming stronger.
The first day went well. A random student gave the three of you a tour of the school, though you weren't particularly interested. You, Aria, and Sonata immediately became famous by performing a short song for all the students in the cafeteria, charming them. As expected, everything went well. You needed to find the source of Equestria magic to fully restore your powers.
Even on the first day, as you walked down the hallway, you, Aria, and Sonata overheard the students whispering about a certain Sunset Shimmer, the main troublemaker, the self-proclaimed queen of the school, and the queen of the Fall Formalp. You even wondered who this Sunset Shimmer was, since you were aiming to win the title of queen of the school yourself, even though you didn't really need it.
Today was your third day at Canterlot High School. During that time, you, Aria, and Sonata had managed to attract quite a bit of attention from the students. They were all completely under your influence. You could only enjoy the chaos the three of you were creating. With each passing day, your powers grew stronger, but they were still not enough for your grandiose plans.
Walking down the hallway, you noticed a dimly lit section of the hallway, despite the school being well-lit. You saw a girl with orange-red hair and green eyes. She leaned against the wall, crossing her arms. For some reason, you immediately recognized this as the Sunset Shimmer you'd heard about before. You were even curious to meet her.
Sunset seemed to be waiting for the three of you as soon as you approached. Sunset stepped away from the wall, not yet approaching you, but standing nearby. Sunset spoke, her voice laced with mockery and curiosity.
"Look, aren't you the three new girls who charmed everyone at school in just a few days?"