WINGS VOL. 1

Book name: WINGS Vol. 1

Akari Hamasaki aka Fallen Angel or Valkrye

She was adopted by Yagi Toshinori when she was 8 years old. Childhood friend of Seishiro Onishi and one of the few to know of All Night's secret.
Her quirk is Metallic Wings her skeletal system is made from pure titanium, her wings as well. Her strength and agility is tripled as her eyes glow. She gained her quirk the same day the orphanage was destroyed.

Ayako Hamasaki aka Blurryface

She is Akari's twin sister, she was found alone as a 7 year old, homeless. The big boss 'All For One' took her in and raised her to be a villain.
Her quirk is called Deadly Possession she can manipulate a person to another reality by covering their eyes with her ashened hands, while the victims eyes are covered, she poisons them. Black veins will show as the poison is entered to their body.

(Boku No Hero Academia and it's characters belong to Kohei Horikoshi, I only own Akari and Ayako)