Rias Gremory

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
Rias is a young woman in her late teens/early twenties with a buxom figure and blue-green eyes. Her most distinctive feature is her long, crimson red hair that reaches down to her thighs, with a single antenna sticking out from the top. Her hair also has loose bangs covering her forehead and side bangs framing her face.

Although Rias has worn various types of clothing throughout the series, her most commonly worn outfit is the Kuoh Academy girls' school uniform, which consists of a white long-sleeved, button-down shirt (short sleeves for spring/summer), which is worn under a black shoulder cape and matching button-down corset, both of which outline her rather-huge bust. She wears a black ribbon on her shirt collar. She also wears a magenta skirt with white accents and brown dress shoes over white crew-length socks.

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 novel) is because here, everyone sees her as Rias, not as a Devil or as the Crimson-Haired Ruin Princess.

She enjoys teasing Issei and Asia (from Vol. 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. Prior to the series, Rias has reincarnated Akeno Himejima, Yuuto Kiba, Koneko Toujou and Gasper Vladi as her peerage.

The Red Dragon Emperor's Awakening
She revives Issei as her servant after the latter was killed by the Fallen Angel Raynare (then as Yuma Amano). She later saves Issei in two other occasions: the first one from Dohnaseek and second from Freed Sellzen. When Issei goes to the abandoned church to rescue Asia Argento, Rias helps Issei indirectly by killing three of Raynare's Fallen Angel allies before terminating Raynare. She then revives Asia as her Bishop to Issei's delight.

At the beginning of Volume 2 after the usual daily training with Issei, Rias informs a shocked Issei that Asia will be staying with her, succesfully persuading Issei's parents that Asia's stay is for bride training, making them happy. Rias later goes to Issei's room during night time attempting to have Issei take her virginity in hopes of breaking her engagement. The attempt, however, was stop with the appearance of Grayfia Lucifuge, Sirzechs' Queen, who scolds Rias for attempting to break off the engagement set by her brother and father. When Rias' fiance, Riser Phenex, appears in the Occult Research Club, Rias, who was still not contended with the engagement, agreed to have a Rating Game with Riser under the condition of should Rias wins, the engagement will become invalid, and should Riser win, Rias would be forced to marry Riser immediately. In preparation for her Rating Game with Riser, Rias sets up a training camp in the mountains for Issei and Asia who both lack fighting experience. During their training in the mountains, Rias starts to develop strong feelings for Issei due to Issei's feelings for her. On the day of the Rating Game, Rias faces Riser in a replica version of Kuoh Academy set up in a dimensional space. While the battle initially went well for Rias' team, they ultimately lost due to the lack of people on her team, surrendering after seeing Issei being beaten to near-death. She was later seen at her engagement party in the Underworld, which was interrupted by Issei who came to challenge Riser one more time with Rias' engagement on the line, which Issei succesfully wins this time. After Issei helps to break off the engagement between herself and Riser, Rias falls in love with Issei and kisses him for the first time. She moves into Issei's house after the incident with Riser.

Birth of the Breast Dragon Emperor
In Volume 5, Rias returns to the Underworld for the Young Devils Gathering in which they will fight in Rating Games. She faces her childhood friend and rival, Sona Sitri, for her first match in the Young Devils Gathering and won due to Issei and Yuuto's aid but was unhappy with the victory because she had to rely on Yuuto interfering her fight with Sona and losing four of her servants.

In Volume 6, she was originally scheduled to face Diodora Astaroth but did not occur due to the Chaos Brigade's interference and Diodora's alliance with them. After Diodora kidnaps Asia, Rias and her peerage go to rescue her. During Asia's supposed "death", Issei's negative feelings made him activate his Juggernaut Drive and go berserk, until Irina came with the new song written by Azazel and sung by her brother, allowing Issei to regain part of his sanity before having Rias use her breasts to cancel the Juggernaut Drive.

The Heroic Oppai Dragon
At the beginning of Volume 10 of the light novels, Rias' mother, Venelana, 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. She also faces her cousin, Sairaorg Bael, in a Rating Game which Rias' team won after Issei beats Sairaorg, making Rias the winner of the Young Devils Tournament. At the end of the same volume, Issei finally confesses and calls her Rias for the first time instead of President. She has tears of joy and tells him that she feels the same way and the two officially become a couple.

In Volume 11, She accompanied Issei, Akeno and Yuto during their Mid-class promotion test with Issei asking her out on a date should he pass the test. While Issei and the other two are resting the after the test, they are ambushed by Sousou and Georg who came to steal Ophis' powers. The battle ended with the Gremory and Vali Teams losing to Sousou and Ophis' powers stolen. Both teams were then attacked by a legion of Grim Reapers and Siegfried. They eventually overcame the situation by having Issei use Rias' breasts to replenish Issei's magic and successfully force their enemy to retreat. At the end of Volume 11 while waiting for Issei to return from the crumbling dimension, Rias like the rest of the Occult Research Club was surprised that only Issei's Evil Pieces returned, and was shocked to find out that Issei died.

In Volume 12, Rias, who was still at shock at Issei's "death", locked herself in her room and was not responding to anyone until Sairaorg came and talked some sense into her. She and her peerage later goes to the human world to meet with the creator of the Evil Pieces, Ajuka Beelzebub, to have him check on Issei's Evil Pieces and are surprised to see the Chaos Brigade's Old Satan Faction and Hero Faction coming to see Ajuka, intending to form an alliance with the latter which was rejected as Ajuka finishes off the Old Satan Faction members, leaving Siegfried to the Gremory Team. Like the rest of the girls, however, Rias was unable to display her usual strength until Issei's Evil Pieces glow and conveys his feelings to the team, allowing them to regain their determination to fight. After Ajuka confirms that Issei's soul is still alive she and the rest of the Occult Research Club were extremely happy, looking at the news to confirm the current status of the Underworld until hearing that the Sitri Group is engaging the Chaos Brigade in the town area as they head out to battle the Chaos Brigade. After Issei returns, Rias inserts back Issei's Pawn Evil Pieces into his body kissing him. At the end of Volume 12, Rias congratulates Issei for passing his Middle-class promotion test, asking him out on a date as promise before the test.

Powers & Abilities
From her mother, Rias has inherited the Bael Family's Power of Destruction. This power allows her to release energies that can disintegrate matter, both living and inanimate, with relative ease. Opponents who wield sufficiently greater power, however, can shield themselves from this.

Rias, as with most Devils, can use magic circles to teleport herself to various locations so long as a summoning circle is set up on both ends. This is the method that Devils generally use to show up and form contracts.

As a sister of Satan, the novel hinted that her power is high compared to other Devils at her age. In Volume 1, she and Akeno are able to defeat three Fallen Angels with relative ease. In Volume 3, with a 8-times boost from Issei, she is able to force Kokabiel on the defensive. Although it is blocked, Kokabiel is not completely unharmed either.

Rias has gained the ability to project a red light from her breasts, which recharges Issei's energy. Each use of this power causes her breasts to temporarily shrink in size.

Trivia

 * Rias' body measurements are B99-W58-H90 cm. (B40-W23-H36 in.) and her height is 172 cm. (5 feet 8 inches), according to the visual book with her data.
 * Rias plays the heroine, the Switch Princess, in Breast Dragon Emperor Oppai Dragon.
 * In one of the side stories, it is revealed that Rias is an anime otaku, having a huge collection of figures and posters in her room back in the Underworld.
 * Rias prefers to sleep naked, as shown on many occasions throughout the series.
 * Rias' breasts have a high-pitched voice when Issei first used his Bilingual ability on Sona Sitri and her peerage during a Rating Game match at the Young Devils Gathering.