Rossweisse

Rossweisse is one of the female protagonists of High School DxD. A former bodyguard for Odin, she is now a teacher at Kuoh Academy. Her rank among Rias' peerage is "Rook", alongside Koneko.

Personality
Rossweisse is known to be a very serious person. She has a tendency to buy things at sales when they're cheap, allowing Issei to coin for her the nickname "The 100-Yen Shop Valkyrie". She is extremely bitter about not having a boyfriend and will get angry when made fun of because of that. In Volume 12 she becomes interested in Issei.

Birth of the Breast Dragon Emperor
She first appears in Volume 5 as Odin's bodyguard telling him not to look at Serafall Leviathan lecherously.

The Heroic Oppai Dragon
She later reappears in Volume 7 and helps in the battle against Loki and Fenrir and sealed Loki with her spells. She was abandoned shortly after that by Odin and was persuaded by Rias into becoming her servant. In Volume 9, after having being teased by Azazel she snatches his alcohol and drinks all of it making herself drunk which indirectly caused her loss when she fought against Heracles.

Powers & Abilities
Rossweisse is highly proficient in the use of Norse magic, specializing in long-range and bombarding attacks. Upon returing from her training in Valhalla in Volume 12, she starts to use defensive spells that are strong enough to block Balance Breakers.

Trivia

 * Rossweisse is the last main character to join Rias's peerage.
 * Rossweisse, being a Valkyrie, is said to be a half-God.