Vivana Oniguma

Vivana Oniguma (ヴィヴァーナ＝オニグマ) is a character introduced in Souyaku Toaru Majutsu no Index. She was a dark side researcher, specializing in the field of torture.

Appearance
Vivana has long white hair and pink eyes. She wears a priestess like uniform.

Background
At some point in the past, Vivana lost a lot of money buying a book that turned out to be a forgery made by the counterfeiter Perfect Film.

Operation Handcuffs Arc
On December 25th, as Operation Handcuffs was spiralling out of control, a scared Vivana, carrying some of her torture-related possessions, was cornered in an alleyway by a pair of Anti-Skill officers, but a misunderstanding when she grabbed back one of her books coupled with the existant circumstances surrounding Handcuffs caused one of the officers to deem her harmful and move to shoot her. A disagreement and struggle with his fellow officer ensued, resulting in an accidental weapon discharge that killed them both, allowing a dismayed and embarrassed Vivana to escape with her life.

Late that night, she attempted to obtain a fake ID from the counterfeiter Perfect Film in School District 6 (like many others targetted in Handcuffs), only to find him already dead. Running into Hamazura Shiage and Takitsubo Rikou at the counterfeiter's tent, Vivana noticed Takitsubo's condition and applied a moxibustion treatment to relieve it. In return for that (and making use of her Coin of Nicholas), Hamazura took her along as the two fled the scene. While the group were blending in at the park and trying to figure out their next course of action, when Hamazura learned he needed a special screwdriver to open up the hard drive he had obtained from Perfect Film's safe, Vivana suggested visiting the Urban Mine, the temporary trash storage area between School District 11 and 23.

Vivana ended up separated from Hamazura and Takitsubo on the underground way to School District 23, and while paused in a moment of indecision, encountered Risako, who was being pursued by a maddened Rakuoka Houfu. Vivana chose to protect the young girl from the murderous Anti-Skill Aggressor and managed to bring him down, but sustained life-threatening injuries in the process. Arriving at her destination later and finding Hamazura and Takitsubo under attack from the android Ladybird, she intervened despite her condition, sealing her fate. Before dying from her injuries, she told Hamazura how he could use her book and possessions to perform moxibustion for Takitsubo.

Post-Handcuffs Arc
Vivana was referred to numerous times post-mortem by various individuals on December 29th, during events in the aftermath of Operation Handcuffs, including the escape of surviving prisoners following the Overhunting crash and the conflict in the Vanishing Tunnel surrounding the captive Risako, whom Vivana had saved at the ultimate cost of her life and whose feelings the ghost of Kihara Hasuu sought to manipulate for his own ends. Having witnessed the events of Operation Handcuffs and Vivana's role in them, Kazakiri Hyouka used her yarai to finish off Kihara Hasuu's ghost, dealing the final blow to the lingering evil in her place.

Abilities
Vivana is an expert in research relating to torture, and has knowledge of the various methods and implements used in it, as well as how to apply them.