Bologna Succubus

The Bologna Succubus (ボロニイサキュバス) is a Transcendent of the Bridge Builders Cabal, introduced in Souyaku Toaru Majutsu no Index.

Appearance
The Bologna Succubus is described as a beautiful horned and winged woman, appearing college-aged by Touma's reckoning. She has light skin, long, fluffy blonde hair, a large bust, and pink eyes with heart shapes in them. She also has a pair of goatlike horns, a pair of giant, thin bat-like wings with claws in a vaguely heart-shape, and a long tail with an arrowhead-shaped tip, all light pink. Her attire, also all pink, consists of a lacy one-piece corset with rose thorn decorations, arm covers, stockings and high-heels.

Personality
Being associated with the story of a death sentence handed over an accusation of running a brothel of wanton succubi, the Bologona Succubus has made it her purpose to protect the reputation of the falsely accused and hates any such accusations, willing to risk her life to save victims of them, and fight her fellow Transcendents over such matters.

Background
She is a succubus associated with a case in 1468 where a man in, Italy was found guilty of running a brothel of succubi and executed for it. Because of court records concerning the case, she is apparently one of the few demons officially recognized by the government of the time.

Post-Handcuffs Arc
When Aradia was guiding Anna around their base, the Bologna Succubus was carrying a plastic bath set and humming on her way to the bath.

New Year's Eve Arc
As the cabal became split as to how to approach the issue of Kamijou Touma, the Bologna Succubus was on the side of the Rescuers. When Aradia attempted to kill Touma on December 31st, she acted together with Good Old Mary to save his life, with Mary employing her resurrection technique twice to save Touma and the Bologna Succubus donating her blood to make up for the blood he lost.

After Aradia's second assassination attempt, the Bologna Succubus stayed with Touma and attempted to fly him to safety. She would accompany him throughout much of the day afterwards.

The Bologna Succubus was eventually mortally injured by Aradia and her witches, and close to death, having lost too much blood for Good Old Mary's resurrection technique to work and humans being unable to give blood to a demon unlike vice versa. However, following Kumokawa Seria's suggestion of using a substitute to stabilize her blood pressure enough for the resurrection to be carried out, she, Mary and Index managed to find a suitable substitute (some iron distribution fluid in a cosmetic surgery clinic) to save the Succubus, with Mary staying to watch over her afterwards and Seria having slipped a GPS tracker onto her.

New Year's Arc
On January 2nd, when Touma was invited to the Bridge Builders Cabal's newly established consulate in School District 12 by Alice (rendering the GPS tracker unnecessary),  the Bologna Succubus was recovering in one of the third floor rooms.

During dinner, Touma and several others took the Bologna Succubus's share up to her room, where she was entertaining herself with one of Academy City's VR games. When Alice started to take an interest, she quickly employed her Cold Mistress at Mary's shout before dissuading Alice. To Touma's dismay, Bologna Succubus had no objections to the plan to unilaterally execute Anna Sprengel immediately, as the accusations against her were not false.

Abilities
As a Transcendent of the Bridge Builders Cabal, the Bologna Succubus is said to be powerful enough to rival the regular magic side on her own. Outside of this, she is capable of flight using her wings and her tail is prehensile. Like some other Transcendents, she uses 'common tone creation' (共通トーン作成) to translate and synthesize her speech into unfamiliar languages.

Given the cases of the other Transcendents in the cabal,   the Bologna Succubus likely possesses a seal that she can release in order to manifest her fullest power. The exact nature in her case is currently unknown, though Aleister Crowley mentioned that while not sure he could make some guesses from the data he'd acquired.

Cold Mistress
The Bologna Succubus uses a spell known as Cold Mistress (コールドミストレス), which converts pleasure signals into pain. It has a large range, capable of covering the whole of Shibuya and possibly more, with both specific and general targetting.

As the Bologna Succubus described to Kamijou Touma, during the there were sinners who claimed to have slept with incubi or succubi, and the recorded confessions of the experience extracted from them through torture generally come in one of two kinds - either it provided great otherworldly pleasure, or it was painful, cold and disgusting. Accordingly, Cold Mistress can replace any and all pleasure signals with pain, up to intense and excrutiating levels.

It is said that the greater the happiness a target is feeling, the greater the hell the Succubus can condemn them to. These pleasure signals include the desires for food, sex and sleep, described as instructions meant to efficiently guide people towards survival and reproduction through attempts to fulfill their animal desires. Turning them on their head, the Bologna Succubus can kill people through starvation or sleep deprivation, or prevent reproduction. As demonstrated with Aradia while she was trying to power through the agony born from the pleasure of an imminent victory, it can also be switched off suddenly to cause all of the affected signals and emotions to flood back, momentarily delaying the target.

By adjusting the magic's strength, Cold Mistress can used to create a nagging irritation and subconscious source of unease, which attempts to soothe will only worsen, the irritation coming to dominate the mind. As the Bologna Succubus herself has mentioned, when faced with a large invisible factor that they have trouble understanding, humans have a tendency to look for someone to blame and direct their hatred towards a closer, more visible target, attempting to eliminate it to reclaim peace of mind and calm themselves. The witch hunts were cited as an example, with many accusations of virtuous citizens towards one another, not even attacking the real supernatural demons at the center of the issue. Exploiting this, with the right trigger, the Bologna Succubus can deliberately set off mass hysteria and an artificial 'witch hunt'.

While the spell is a potent one, and has been described as possibly capable of stopping the cabal's feared Alice Anotherbible if the conditions were right,   it is not effective if the target is not seeking pleasure or comfort, and they can drown themselves in negative emotions such as hatred and regret in order to avoid it.

Trivia

 * The accused in the case that forms the Bologna Succubus's backstory, charged with summoning demons and running a brothel of succubi, was apparently a Servite friar named Giovanni Faelli da Verona, trial and final condemnation in 1468 by inquistor of Bologna, Simone da Novara, apparently three years after a previous trial on a charge of necromancy by predecessor Girolamo Parlasca da Como.