Rias Gremory

Rias Gremory (リアス・グレモリー, or Riasu Guremorī) is a warrior and mage of Kuraihikarigakure. She is a Devil from the Gremory Clan, a family of pure-blooded Devils, and is known as the Crimson-Haired Ruin Princess. She's also the sister of the First Akumakage, Sirzechs Lucifer and Issei Hyoudo's girlfriend.

Background
Rias is the daughter and second child of the Gremory Family. She became the heir after her brother, Sirzechs, became the Satan Lucifer, losing his right as heir to the house. After being announced as the heiress of the Gremory Clan, Rias was eventually placed into an engagement with Riser Phenex, which was dissolved after Riser being found guilty of conspiring against Sirzechs live along side with Barakiel.

Powers & Abilities
Power of Destruction (滅びの力, Horobi no Chikara): A type of demonic energy that allows her to release energies that can disintegrate matter, both living and inanimate, with relative ease. She is further able to control the shape and power of the technique such as creating multiple softball sized bullets to lessen the destructive force yet increase the range of her attack.

Demonic Power: Rias has all the common skills and powers of a Devil. She is also shown to be at least somewhat proficient in the use of spells, such as the ritual to drain energy from Issei's left hand to let it appear human again, healing, teleportation by magic circle, and others.

Expert Tactician: Though outsmarted several times throughout the series, Rias has proven herself to be an excellent tactician and has saved her team along with others many times due to her profound intellect and her ability to handle unexpected difficulties calmly.

Flight: Being a Devil, Rias can fly using her wings.