Rossweisse

Rossweisse is one of the many female protagonists of High School DxD. A former bodyguard for Odin, she is currently acting as a Civics Teacher at Kuoh Academy. She is Rias' second Rook, alongside Koneko.

Appearance
Rossweisse is a beautiful young woman appearing to be around the same age as Issei with long, silver hair and light blue eyes.

Her battle attire is normally of a set of Valkyrie armor, which consists of a white chestplate with gold and pale blue accents and matching, fingerless guantlets, boots, hip guards, and wing-shaped hair clips. She also wears a black leotard underneath her chestplate, black thigh-high stockings. and a pale blue cloth wrap underneath her hip guards, all of which are clad with pink lacing along with her hair clips.

For her teaching position at Kuoh Academy, she wears a simple business suit and skirt.

Personality
Rossweisse is known to be a very serious person. She has a tendency to buy things at sales when they're cheap, causing Issei to coin for her the nickname "The 100-Yen Shop Valkyrie". She is extremely bitter and sensitive about not having a boyfriend and easily angry when made fun of. Despite her seriousness, she is highly susceptible to alcohol, and one drink from it can leave her drunk and vomiting for extended periods of time.

In Volume 12, she becomes interested in Issei.

History
Rossweisse was raised in the countryside by her grandmother as both her parents are warriors who serve the Norse Gods and rarely come home. At some point before the series, she was appointed as Odin's bodyguard. During her time with Odin, Rossweisse was basically used as a maid by Odin, taking care of him during his trips, supporting Odin with his daily life despite her small salary and was even mistreated by her fellow Valkyrie who called her Odin's "Servant Girl".

Birth of the Breast Dragon Emperor
Rossweisse makes her first appearance in Volume 5 as Odin's bodyguard, reminding him of his status and telling him not to look at Serafall Leviathan lecherously. Odin responds by mocking her for not having a boyfriend.

The Heroic Oppai Dragon
She later reappears in Volume 7 during Issei and Akeno's date, scolding them for being in the motel during the day and telling them that high-school students should stay home and study. She then accompanies Odin to the Hyoudou Residence, scolding Odin for looking at Rias and Akeno's breasts lecherously before introducing herself to the Occult Research Club and was embarrased when Odin added the point on her not having a boyfriend. She later helps in the battle against Loki and Fenrir and sealed Loki with her spells. She was abandoned shortly after that by Odin much to her horror, claiming that she was fired. She was then persuaded by Rias into becoming her servant, seeing all the benefits she can get by becoming a Devil and having a stable job of becoming a teacher at Kuoh Academy.

In Volume 9, she accompanies the second-year students to Kyoto. When Issei attempted to peek at the girls, Rossweisse attempted to stop him only to become another victim of Issei's Dress Break, much to her horror due to the fact that her jersey (which was bought under discount) was spoiled. When Issei sees Azazel drinking in the morning telling him that it is not good for health, Rossweisse strongly agrees and lectures Azazel on the fact but was cut short after having being teased by Azazel on not having a boyfriend. Angered by that, she snatches his alcohol and drinks all of it, making herself drunk. This action, however, would indirectly cause her loss when she fought against Heracles.

In Volume 10, she and Koneko fought against Misteeta Sabnock and Gandoma Balam at the Rating Game between their masters, winning the match. She, Xenovia, and Yuuto Kiba would then face Sairaorg Bael but lost to the latter.

In Volume 11, Rossweisse goes back to Asgard to train after her defeat in Kyoto and in her match against Sairaorg but reminded Issei of his mid-term test and prepared a question paper for his reference before leaving.

In Volume 12 , she returns after learning various defense magic from her country, which allows her to defend against attacks that are 10 times more powerful than Heracles' Balance Breaker. She also told Rias and her comrades about the rumors that she heard in her homeland regarding the Vampires, that a certain noble Vampire house captured a Longinus possessor which lead to battles between Vampires. After Issei successfully passes his Middle-class Promotion test, Rossweisse like all the female members of the Occult Research Club, decided to go out on a date with Issei.

The Legend of Oppai Dragon and his Lively Companions
During the events of Volume 14, Rossweisse participated in the meeting of Mephisto Pheles in regards to making a pact with a Magician due to the Gremory group's recent popularity. Later, she participates in the meeting with the Vampires from the Carmilla Faction. She, along with with rest of the Gremory group (excluding Rias and Kiba), later team up with the Sitri group to rescue Ravel, Koneko, and Gasper after the three were taken captive by the Magician Faction.

In Volume 16, Rossweisse, along with the Occult Research Club members, Bennia, and Loup Garou, went to Romania to aid Rias and Yuuto who were confined in the Tepes castle. On their way to the Tepes' castle, Rossweisse told Issei that she received an offer from Sona Sitri to become a teacher in the Rating Game school that the latter is building. She then participated in the attempt to stop the extraction of the Longinus, Sephiroth Graal, from Valerie Tepes and rescue her; fighting the enhanced Vampires and Grendel along the way. Rossweisse later teamed up with Yuuto to defeat the mass produced Evil Dragons that are rampaging in the Carmilla's castle town. After returning from Romania, she participated in the meeting for the formation of D×D.

Powers & Abilities
Magic : Rossweisse is highly proficient in the use of Norse magic, specializing in long-range and bombarding attacks. She is capable of using ice, fire, water, lightning, wind, thunder, light, summoning, and explosive based magic.
 * Defense Magic : Upon returning from her training in Valhalla in Volume 12, Rossweisse starts to use defensive spells (using the trait of Rook) which are strong enough to easily shield against Balance Breakers.

Trivia

 * Rossweisse's body measurements are B96-W61-H89 cm. (B38-W24-H35 in.) and her height is 173 cm. (5 feet 8 inches), according to the visual book with her data.
 * Rossweisse is the name of one of the Valkyries featured in Richard Wagner's opera Der Ring des Nibelungen (The Ring of the Nibelung).
 * Despite being around Issei's age, she has already finished high school and most of college in Valhalla.
 * In the future, Rossweisse has stated that she wants to establish a Norse magic school in the Gremory territory, and start a business training new Valkyries out of female Devils.
 * Rossweisse, being a Valkyrie, is said to be a "Half-God".
 * Rossweise's dream is to build a discount store in her homeland which has every good imaginable.