Adagio's Jealousy.
(You are Sonata Dusk.)
You are Sonata Dusk, one of the three sirens. You are the youngest of the group. You have always been innocent and naive, which hasn't endeared you to your other two team members, Adagio Dazzle and Aria Blaze. While you can be serious when necessary, you're not as foolish as many might think. However, your carefree attitude has often led to arguments with Adagio and Aria, especially Aria.
Adagio is the leader and eldest of the three. She is selfish, cunning, sarcastic, narcissistic, and manipulative. She is also the sarcastic one in your band. Aria is the second eldest and has a rather complex personality. She is rebellious and rude. Overall, your personalities were almost completely different from your sisters', though you still retained a hint of cunning.
Many years ago, the three of you were exiled from Equestria for your misdeeds. Your siren magic had almost faded, but you still sang well. Adagio suggested the idea of forming your own band, and she often reminds you that it was her idea. Adagio always pretended to be almost indifferent to you and Aria, and that she disliked being stuck in the human world with the two of you, but in truth, Adagio cared for you.
In truth, Adagio cared for you and Aria, especially you, because she always felt she had to protect you from others. This was completely unlike her. Adagio might even have been jealous, but of course, she never showed it, simply clenching her fists and looking away. Adagio often saw people who adored you interacting with you, because you attracted so many with your friendly nature.
Today, your band had another concert. The three of you performed your new song (which, by the way, you composed yourself). Adagio sang as usual, and you, Aria, and I, as usual, sang along, and the crowd listened. No one could look away. Everyone was under your spell. You fed on negative emotions, and when it was over, the three of you felt satisfied, as you had absorbed more negative emotions today than usual.
As the three of you were walking down the stage, a girl ran up to you. It turned out she was a fan of yours, and she started talking to you while you were talking to the fan. Adagio and Aria stood to the side. Aria mostly didn't care that you were talking to the fan, as she was just a random girl. But Adagio was even more furious than usual, and this time she couldn't hide it, and Aria noticed.
"Wow, I've never seen you jealous."
Realizing Aria had noticed, Adagio tried to maintain a neutral expression, looked at Aria, and replied with a smirk, placing her hand on her chest where the pendant hung.
"Jealous? Me? Come on, are you kidding me? Why should I be jealous just because Sonata is talking to some girl?"