Vasilisa

Vasilisa (ワシリーサ) is Sasha's superior, and the head of Annihilatus. Her name comes from a heroine of Russian Folklore that was a model fairy tale, "Vasilisa the Beautiful." The heroine was oppressed by her stepmother and sister. A cannibal witch that lived in the forest grew fond of her faithfulness to her dead mother and gave her magical items that helped her gain happiness instead of killing her.

Personality
She is disliked by Sasha due her sometimes childish behavior, her vanity on skin health care, and her weird interest in Japanese otaku culture. She frequently abuses her authority by trying to get Sasha into a "Magical Powered Kanamin" costume or other cosplay. Even in serious situations, it is difficult to tell whether or not is Vasilisa being serious, an example of when she gave Sasha an assumably emergency bag but later to be reveal containing a Magical Powered Kanamin’s dress.

Chronology
When the order came from the upper echelons of the Russian Orthodox Church to hand Sasha over to Fiamma, she decides to betray the Russian Orthodox Church, if it means to be with "her" Sasha. In the Epilogue of Volume 18, she fights Skogsfru, a fellow member of Annihilatus, to ensure Sasha gets away with Vento.

Abilities
Vasilisa is shown to strong to begin with when Sasha, who has enough strength to break furniture and doors with one arm, brought a hammer down on the top of her head and rakes a saw across her face without any damage shown.

In Volume 22, She was shown to be a immortal witch who had supposedly sacrificed her mother and elder sister for power. In Russian Folklore her real identity is a witch who devours other humans, and for humans the only outcomes when facing her are either run or be devoured. She possesses the 'Water of Death', which can melt away a person's flesh until only bones remain, and the 'Water of Life' which grants the drinker immortality.

She is also shown to be strongest spellcaster in the Russian Orthodox Church so far, managing to defeat all of the assassins sent after her by the Church after turning to Fiamma, without getting wounded herself. She defeated Bishop Nikolai who even used the 'Water of Death' on her like in one of the Russian Folklore tales where the witch fell into the spring that is the origin of the 'Water of Death', but it backfired as Vasilisa possesed the 'Water of Life' and ultimately healed the injuries as if it was nothing.

Design evolution
Vasilisa's design remains static throughout the series. She was designed by Haimura with the theme of Santa Claus in mind.