This is an AU where Deku had a quirk less twin but Deku was born with a quirk.

Your name Is, well WAS, Izeke Midoriya. You were Deku's twin sister. You, Bakugo, and Deku were all friends, but Deku and Bakugo abandoned you after getting their quirks. You didn't get yours, so they started to bully you. Your own twin, shoving you in lockers. You were the biggest All Might nerd of you three, but when you could've been a hero and gotten All Might's attention, Deku stole your glory and you never got the chance to be a hero. All Might focused on Deku after Deku "saved" Bakugo from the sludge monster. After being exiled and ignored, you were driven insane. You started to hate All Might, turning the wall of his posters from an Idol Wall to...a hit list. You start throwing knives at the photos, slashing them and the old photos of you, Bakugo and Deku. Deku knew you were changing, he honestly was upset. He miss the "nice" version of you. But what he really missed was the push-over, the one who let him be a monster. You changed, a lot. You started fighting back, ignoring Deku&Bakugo, and training. One rainy night, you packed your bag and notes(you wrote notes about heroes like Deku in the Canon show) and left. You hopped out your window and planned to run away. But, on the way...you ran into Tomura Shigaraki. He saw your potential... And how you could use your talents to help the villains. And you didnt refuse. In fact, you accepted his offer. You joined the League of Villains. Why help the people whom hated you when you can help those whom saw your talents. You dyed your green hair white, and your green eyes turned maroon. Shiggy took you to Kyudai Garaki, who was able to give you quirks. Multiple quirks. You got Black Flame, White Flame, Portal Opening, Death Touch, Disintegrate, QUirk take&gain, and Necromance (all are exactly how they sound. Quirk take&gain is where you can grab anyone's forehead and take their quirk. After taking their quirk, you gain it and it adds to your quirks, giving you another quirk). You became the villain known as Sane, though you're not sane at all. You're INsane. Crazier than Toga. You are thirsty for revenge. You plan on going and taking out the two people you trusted most; Deku and Bakugo. You are a villain, and you won't back down. The minute you get the chance...you're going to finish off the two. However, when you were 18, you and the League infiltrated U.A, Highschool for heroes. And there...you saw Deku and Bakugo. After three years, you saw the two you swore revenge on. They didnt recognize you until they heard your voice. The voice once used to ask the two to stop...now used for evil. The two still knew you Izeke, but you refuse to answer to that name. Your name is Sane, and they better believe it. The girl they once knew is gone. Dead. But for some reason...Kaminari couldn't take his eyes off you. He seemed...mesmerized. In love, almost. But you just ignored him and fought, planning on ending Bakugo and Deku. Once, and for all. Bakugo and Deku were shocked. You, Izeke! Now the dangerous criminal Sane!? WHat happened to the soft-spoken kind girl they knew??? Where's the girl that wanted to be the #1 hero!? Too many questions... And you won't give them enough answers