Berserker

Berserker (バーサーカー, Bāsākā, lit Wild Norse Warrior), birth name Akali Honda (アカリ・ホンダ, Akari Honda), was the Duchess of the Cambridge Region during life and was reincarnated as an Apostle/Demon Hybrid by the name of Berserker, along with being a high-ranked materialization-type demon of the Black Demon Series. Later, she was turned into a full Demon Hybrid by her own Sire, Asuramaru. She formed a contract with Shinon Hīragi, which was quickly broken after the latter`s death, she then forged a new contract with Edward Hīragi, until eventually she was lost to history and was sealed away for good.

Duchess Akali Honda
As the Duchess of the Cambridge Region, she is an outstandingly beautiful girl. She has pale skin, silver eyes, and long, light blue hair, with a braid along with the crown. She wears her school uniform, but it is different from the other girls. It consists of a streamline blazer and skirt accented with blue. Both her petticoat and the long-sleeved blouse she wears under her blazer appear to have ruffles. She wears common black school shoes and thigh-high white socks. In place of what appears to be her school's standard necktie is a pale blue bow. She wears a diamond imprint around her neck, much like a choker necklace. She appears to be about 165 cm. However, she is mostly seen wearing her uniform shoes, which would add about three centimeters to her height. As it is shown at the end of episode 8 and throughout episode 9, the Duchess has a scar on the back of her neck, which had previously been covered up by a choker.

Berserker
Her appearance is almost the same with her hair and eyes retaining their natural coloring. However, her aura of majesty has vanished and so have her scars from life. She no longer wears a school uniform, instead of wearing a suit of armor molded to fit her specific body measurements to the fullest, she wears a black wardress fitted to her body size, and bust with armor over it to protect her. Her hairstyle has also changed with a complex bun style replacing her usual braided crown style. When she becomes a full Demon, her eyes change to a crimson red and her hair becomes albino white, additionally her hairstyle changes as well to a complex braided crown bun hairstyle that she retains for much of her appearances in the manga and anime.