Rias Gremory is the main female protagonist of High School DxD. She is a Devil from the Gremory Clan - a family of pure-blooded Devils, and is known as the Crimson-Haired Ruin Princess. She is a third-year student at Kuoh Academy, the President of the Occult Research Club, and the school's number-one beauty as well as one of Kuoh Academy's Two Great Ladies.
Appearance
On some rare occasions, Rias wears glasses when she's deep in thought, as she feels they make her mind work better despite having normal eyesight.
Personality
Throughout the series, Rias is shown to be kind and soft to her
servants. She thinks of Issei as a special person, and always gets
jealous when girls are around him, becoming a totally different person
when she sees him and other girls together, or when it comes to
training.
She is proud of her family's name, but she does not like being seen as Rias of the Gremory Family. The reason for her living in the human world (as revealed in Volume 2 of the novels) is because there, everyone sees her as Rias, not as a Devil or as the Crimson-Haired Ruin Princess.
She enjoys teasing Issei and Asia (from Volume 3 of the novels onward), but at the same time makes it clear (to Asia or any girl) that Issei is hers, and she does not want to share him (It is revealed in Volume 3 of the novels that the Gremory Family and their servants are beings with extra-ordinary affection among the Devils, so Rias is no exception). She has no problem with showing Issei her breasts or sleeping naked with him (which she always does according to her).
History
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. Prior to the series, Rias has reincarnated Akeno Himejima, Yuuto Kiba, Koneko Toujou, and Gasper Vladi
as members of her peerage. She entered Kuoh Academy two years before
the series along with Akeno, Sona, and Tsubaki. She later established
the Occult Research Club which is used as a base for her servants and
became its president.
Plot
The Red Dragon Emperor's Awakening
Edit


Birth of the Breast Dragon Emperor
In Volume 3, Rias introduces her new servants, Issei and Asia, to the Student Council members led by Sona Sitri, a pure-blooded High-Class Devil from the Sitri
Clan who is her childhood friend and rival. After Issei noticed Yuuto's
change after seeing his childhood photos among one which Issei took
with his childhood friend, Irina Shidou
and her father who was holding a Holy Sword, she explains Yuuto's past
to Issei and was greatly disappointed when Yuuto left her to seek his
revenge after seeing both Xenovia and Irina. She and Sona eventually found out the alliance Issei, Koneko and Saji made with the church duo to destroy the Excaliburs, punishing the two of them for their actions. When Kokabiel, one of the leaders of the Fallen Angels,
announced his war declaration against both the Gremory and Sitri clans
who are attending the Kuoh Academy, Rias gathers all her servants
(except for Yuuto who is still missing) in an attempt to fight back
while having the Sitri Group as support. During the fight, Kokabiel
summoned out many Cerberus to battle the Gremory Team but was defeated
by the combined effort of the Gremory Team and Xenovia who arrived at
the battlefield. After Yuuto attained his Balance Breaker
and broke the Excalibur with Xenovia's help, the Gremory Team was then
forced to battle Kokabiel himself but were easily overwhelmed by the
Fallen Angel Leader and was in despair until the sudden interference of Vali Lucifer who came to retrieve Kokabiel under Azazel's order.



The Heroic Oppai Dragon


