to alcohol, and one drink from it can leave her drunk and vomiting for extended periods of time. Rossweisse is a beautiful young woman with long, straight silver hair and aqua colored eyes who appears to be in her late teens. She is extremely bitter and sensitive about not having a boyfriend and is quick to anger when made fun. She later helps in the battle against. She, along with Rias, Koneko, Gasper, Yuuto, Akeno, and Cao Cao, fought against the group consisting of the Evil Dragon Ladon and three Grendel clones. Rossweisse has a driving license. As a consequence of trying to make up for her perceived shortcomings in magic, Rossweisse's school life was completely academic, to the point that she did not have a social life and looked down on her classmates that rarely spent any time studying, which contributed. Soon, word came that Kuroka and Koneko were being targeted by Grim Reapers due to being involved in their late father's research in artificially creating Super Devils.
She also wears a black leotard underneath her breastplate, black thigh-high stockings, and a pale blue cloth wrapped underneath her hip guards, all of which are clad with pink lacing along with her hair clips. She was then persuaded by Rias into becoming her servant when she looked at the Gremory summary papers and is amazingly fascinated by the huge amount of money, premium insurance, and connection benefits she will receive by becoming a Devil under her peerage, and having. She has a tendency to buy things at sales when they're cheap, causing Issei to dub her "The 100-Yen Shop Valkyrie". Issei called her "moving cannon" due to the fact that she is a wizard-type Rook. After a bit of a scuffle at first, their side had gained the first points. The victory goes to the Gremory Team as Issei was able to defeat Riser. Immediately after, Rossweisse was among the ORC members present when Issei proposed to Rias. Personality, rossweisse is known to be a very serious person. After the ceremony when Asia and Xenovia wanted to move to his peerage. 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. In the end, Rossweise falls in love with Issei and ask him if they can go to a 200 yen shop next time. However, Walburga was soon defeated and arrested.
Regardless, she is considered to be a sought-after expert on the creature by Qlippoth. In Volume 11, it is stated by Azazel that her power is equal to that of a High Class devil. . 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.