Rias Gremory

Rias Gremory (リアス・グレモリー Riasu Guremorī^?) is the female protagonist of the series. She is a third-year student at Kuoh Academy and is the Academy's number one idol. Known as the Crimson-Haired Ruin Princess (紅髪の滅殺姫（べにがみのルイン・プリンセス） Benigami no Ruin Purinsesu^?) and the Princess of Destruction (滅殺姫 Mezatsu Hime^?), she is the heir to one of the highest ranking and famous Devil families, the Gremory Family (グレモリー眷属^?). She is enrolled in Kuoh as an exchange student, but the truth is that she holds the power in the Academy, and acts as the President of the Occult Research Club which is made up of the Devils under her command, and her rank is "King". She is an invincible heroine who saw the power sleeping within Issei, and took a curious interest in him.

In the light novels, it is revealed that her brother is, in fact, one of the Four Satans, Lucifer, and both of them possess the Power of Destruction. She revives Issei as her servant after the latter was killed by the Fallen Angel Raynare. Both kind and soft to her servants, but becomes a completely different person when training or fighting. She is proud of her family's name, but she does not like being seen as Rias from Gremory. The reason for her living in human world is because there, everyone sees her as Rias, not as a Devil or as the Crimson Ruin Princess.

As the series progresses, Rias begins to develop strong feelings and eventually fell in love with Issei which becomes more obvious as Issei defeats Raiser, and becomes very jealous when he is surrounded by other girls. She moves into his house after Issei defeats Riser to end their engagement. At the beginning of Volume 10 of the light novels, Rias' mother, Venelana Gremory, encourages her to push her relationship further with Issei, in which Rias would attempt to seduce Issei but gets frustrated when Issei could not call her by her name. At the end of the same Volume, Issei finally confesses and calls her Rias for the first time instead of President (部長 Buchō^?, lit. "Club President"). She has tears of joy and tells him that she feels the same way and the two officially become a couple. Though it seems none of the other girls (Akeno, Zenovia, Asia, Koneko, Irina, Revel) have given up on Issei.

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