Rias Gremory (リアス・グレモリー, Riasu Guremorī) is the main female protagonist of High School DxD.
She is the Gremory Clan's heiress after her oldest brother, Sirzechs, took the position of Lucifer. Rias is the sole daughter and youngest child of Zeoticus and Venelana Gremory, the aunt of Millicas Gremory, and the maternal cousin of Sairaorg and Magdaran Bael.

She became known as the Crimson-Haired Ruin Princess, because of the color of her hair and Power of Destruction. Now, Rias is a first-year College Student at Kuoh Academy, the former President of the Occult Research Club, and the school's Number-One Beauty, as well as one of Kuoh Academy's Two Great Ladies alongside Akeno Himejima. She is also one of Issei's fiancées.

Kanaリアス・グレモリー()
RomajiRiasu Guremorī
RacePure-Blooded Devil
GenderFemale
Age18 (Vol 1-22) 19 (Vol 22-Present)
Nicknames :Ria (by both Sirzechs & Zeoticus)Heiress of the House of Gremory Crimson-Haired Ruin Princess Princess of Destruction Princess of Gremory Devil Princess (by both Magari & Nurarihyon)Switch Princess (by Bikou & used in Oppai Dragon)Crimson Bust Princess, Oppai Battery, Oppai Beam (by Azazel)Baka-uple (shared with Issei)Red Dragon Emperor's Legal Wife (by Yasaka and Kunou) Madonna of Kuoh Academy The Demon Princess of Summer (Used in Fantasia Rebuild)
Hair ColorCrimson
Eye ColorBlue Blue-Green (Season 1-3)

Family and relationships
Family	Gremory (father)
Venelana Gremory (mother)
Sirzechs Lucifer (brother)
Grayfia Lucifuge (sister-in-law)
Millicas Gremory (nephew)
Misla Bael (aunt)
Sairaorg Bael (cousin)
Lord Bael (uncle)
Issei Hyōdō (fiancé)