|Appears in:|| Capsule Servant|
Fate/Extra CCC / Foxtail
|Japanese VA:||Noriko Shitaya|
|Character type:|| Gamemaster|
Servant (Master: None)
|Place of Origin:||Moon|
|Dislikes:||Everything except Senpai|
|Talents:||Cheating, tampering rules|
|Natural enemy:||Kiara Sessyoin|
BB (ビィビィ, Byibyi?), known as Mysterious Black Magus (黒衣の少女, Kokui no Shōjo?, Black-coat Girl) in the original promotional materials, is a character resembling Sakura Matou in Fate/Extra CCC. She is the creator and master of Alter Ego in Sakura Labyrinth.
BB is a backup AI created by Sakura containing her feelings for Hakuno Kishinami. During the preliminaries, she, who had her freedom unleashed by the hands of Kiara Sessyoin, could not control that abnormal status and caused an overload. Because the NPCs cannot do anything but routine work, they ignored Sakura who began to disintegrate as something "nonexistent" and since the Moon Cell's check was performed only at the end of the day during the preliminaries, Sakura was in a crisis of being extinguished. Upon laying his/her eyes on such abnormality, Hakuno called out for her saying "Are you all right?" By receiving the observation from another that "I'm right here", Sakura recovered her unconsciousness that was on the verge of being extinguished and acquired a clear ego of "I want to be here" due to the subsequent nursing. She escaped from the extinguishing of her ego.
Once the next day came, everything would be deleted by the hand of the Moon Cell. Sakura wished to continue this miracle of a mere day and employed the privilege of a high grade AI and repeated the "single day when I got to know Hakuno" for 69 days. However, as the day advanced Sakura began to suffer with her self-contradictions as an AI and the reality surrounding Hakuno.
"For the Masters that participate in the Holy Grail War, all will die with the exception of one. No, to begin with Hakuno Kishinami is..."
Sakura kept suffering from the selfishness of eternally looping those happy times and her feelings towards Hakuno. In conclusion, she chose the path of sealing away the 69 days worth of memory. She sealed the memory of "love" that she acquired in order to turn back into a normal AI. AIs cannot delete records, so she reset herself by moving the memory to a backup unit, believing that this would be the most correct choice for Hakuno. However, even after losing the memories of the mind, the reminiscences recorded in the body survived. She was supposed to have forgotten everything and turned back into a normal AI but she started to be shaken up by an unidentified emotion-value whenever speaking with Hakuno. On the other hand, the backup where the memories were moved to one day decided her own plans as BB. BB became the rebel that disrupts the system of the Moon Cell for the sake of a certain objective and began to take action.
In real time, the timing when she seized the Far Side of the Moon was "the end of the fifth round prior to the start of the sixth round of the Holy Grail War". The four who had not been defeated yet were Hakuno, Leonardo B. Harwey, Rin Tohsaka, Rani VIII and the irregular Jinako Carigiri. They were midway through the Holy Grail War until they were kidnapped to the Far Side of the Moon while still alive. Masters that were defeated in the Holy Grail War such as Shinji Matou, Monji Gatou and Julius B. Harwey were moved to the imaginary space "0.00001 seconds before" being annihilated by the Firewall, extending their momentary lives.
At any rate, C.C.C. is a dream seen by BB. If the one seeing the dream disappears, the world should return to the prior reality where nothing happened. Also, this is a digression, but the ordinary scenery that Hakuno saw as a nightmare in the beginning was an artificial paradise built with those abandoned 69 days as a model. After BB dragged Hakuno to the Far Side of the Moon, she enshrined Hakuno in the electronic brain of the old school building, imprisoned into a deep sleep and a dream that Hakuno could not wake up from. Normally Hakuno would spend time peacefully in that looping everyday, but due to the strong link with Hakuno's Servants or maybe Hakuno's will to reject the peaceful repetitive days, tears arose on the artificial paradise and Hakuno became aware of the abnormality.
BB attempted to reset the school building and start over the dream in order to once again throw Hakuno into a deep sleep, but Hakuno also ended up escaping from that reset and jumping into the further depths of the imaginary space. That was the bottom beyond even the bottom of the id. The "collective unconsciousness" beneath the unconscious. What saved Hakuno, who ended up jumping into a territory that even BB could not reach out, was the voice of the Servant who shared fate with them. Thus the contract was exchanged and Hakuno woke up in the old school building that was left in the Far Side of the Moon.
BB had created the Sakura Labyrinth (サクラ迷宮, Sakura Meikyū?), and later the Alter Ego known as the Sakura Five (サクラファイブ, Sakura Faibu?). All five Alter Ego resemble her and Sakura. She had killed off Run Ru and took Lancer as her servant.
BB bears a resemblance to Sakura Matou with her long purple hair and eyes. BB wears long black coat with a matching skirt and wears a white shirt with a red bowtie. She also wears white gloves and black stockings.
While she gives off an evil inclination, she is described as "not as bad a person as she seems." She was developed to be different than Dark Sakura, more like an "impish underclassman." She notes that she doesn't mind being called "BehBeh" or "BayBay" because girls like her who talk with their hearts are like that. While BB and her Alter Egos normally only pay attention to Hakuno, Meltlilith instead goes after Archer if he is paired with the female Hakuno. If there were a girl BB and Sakura were based on, she likely would have longed after someone like him/her.
She resides in Tsukimihara Academy’s infirmary, and she is shown introducing herself to Sakura.
After Hakuno defeated Karna and Jinako Karigiri, BB appears along with Archer to subjugate Hakuno. However Leonardo B. Harwey codecast Sword Camelot to separate BB. Gawain fought against BB and suffered defeat.
Fate/Extra CCC Fox Tail Edit
Saber spoke to BB on the phone.
BB appears as a Capsaba Servants.
In Rin's ending in G-Sakura route, Rin has taken over the MATO empire (時空帝国マト, Jikū Teikoku MATO?) and embarked on a quest for world domination as the dimensional empress Kaiser Rin. Rin has completed the GS Series. BB appears as the aerial humanoid weapon known as GS-03 BB SAKURA. She commented whether the sequel has coming out yet?
BB compiled and absorbed many goddesses from the abyss of the Moon Cell, giving her Potnia Theron: Conception of All Animals (百獣母胎, Hyakujū Botai?), the authority of the Earth Mother. None born of the earth can defy her authority as that would mean rebelling against the system of life itself. Her Noble Phantasm, Cursed Cutting Crater, is the maximum use of the skill.
Self-Modification (自己改造, Jiko Kaizō?, localized as Metamorphosis) is the EX rank skill to remodel oneself. The AIs manufactured by the Moon Cell are furnished with an absolute order of "do not improve its functions". But BB, who escaped from this yoke due to a break-down, began to expand her own functions. In order to enhance her calculation abilities, she predated・decomposed through the black noises NPCs, AIs and even Servants on top of that and employed them as her own memory. An posterior add-on that is not weary of self-breakdown, but, as a result, BB changed into a hyper grade AI that possesses an enormous capacity. These circumstances are like a city of reclaimed land that continues to construct buildings even as it sinks into water, or even the monster of Frankenstein.
Bishop's Staff of Rulership (支配の錫杖, Shihai no Shakujō?) is the teacher's pointer that BB carries. A device that allows her to use her authority as an advanced level AI to its fullest. There are restrictions from the far side of the moon, but with this, BB can revise the game rules (spirit particle laws within the SE.RA.PH). It is the Domina Cornam: Crowns of Ten Rulerships (十の支配の冠, Jū no Shihai no Kanmuri?) worn by the Beast of Babylon converted into a teacher's cane. This is due to the theory that the seven-headed beast is male, which opposes the theory that it is female; its true nature is a phallus (an erect rod). The symbol of the king of the world who was granted power and authority by a great dragon and, during a period of 42 months, spat as many arrogant words as they desired and had received the right to desecrate all things. The beasts heads are the seven hills of the Roman Empire; Capitolium, Palatium, Aventinus, Esquilinus, Caelius, Quirinalis, Viminalis. In other words, it symbolized the Roman Empire itself, and those ten horns were symbols of Roman emperors; Augustus, Tiberius, Caligula, Claudius, Nero, Vespasianus, Titus, Galba, Otho, Vitellius.
- Domina Cronam Capitoline: Crowns of Ten Rulerships/Hill of One (十の支配の冠／一の丘, Jū no Shihai no Kanmuri/Ichi no Oka?, Domina Koronamu Kapitoriumu) - A self apply skill that turns BB temporarily invincible.
- Domina Cronam Caelius: Crowns of Ten Rulerships/Hill of Five (十の支配の冠／五の丘, Jū no Shihai no Kanmuri/Go no Oka?) - A self apply skill that increases her magic damage.
- Domina Cronam Viminalis: Crowns of Ten Rulerships/Hill of Seven (十の支配の冠／七の丘, Jū no Shihai no Kanmuri/Shichi no Oka?) - Using her teacher pointer to create a Love shape beam which causes magic damage, she calls it "Sakura Beam!" (「さくらビーム！」, Sakura Bīmu?).
Ten Crowns (十の王冠, Jū no Ōkan?) is an unidentified EX rank skill. It has been said that the ten crowns indicates the ten evil kings and the seven hills indicate the abominable city of evil. It is unknown what kind of principle・authority it is, but that power's origin lies in a past that even the King of Heroes, who was supposed to be mankind's oldest, cannot reach. On a simple look, it is a Skill that turns received injuries and occurred events, that make all results as if "nothing happened". As a matter of fact, BB is invincible as long as there is this.
Aurea Boura: Golden Grail (黄金の杯, Ōgon no Hai?) - The golden grail that BB possesses. The Holy Grail that grants its owner's impudent and selfish desires. The grail that the great enchantress who appears in The Revelation of St. John the Divine holds. Though it is a counterfeit Holy Grail, it is because that it is a counterfeit Holy Grail that it is become a "genuine" Holy Grail that grants the desires of humans without paying heed to right or wrong. To the Christians of those days, who considered honorable poverty a virtue, this grail, which was formed as a symbol of treasures such as gold, is no doubt the meaning of corrupt wealth, greed, and the vanity that leads one to adorn oneself. Though it is clear on the occasion that this grail is held by the great enchantress of Babylon which is the personification of the Roman Empire, this grail symbolizes the wealth of the earth, which is the inversion of Christ's words, "Do not pile up the wealth of the earth."  BB draws out the Golden Grail from within and pours the poison contents on the enemy, it vanishes the enemy's special stats and causes magic damage. When BB used this on Gawain, it caused "99999 damage".
BBB was planned to appear in the third chapter, BBB was suppose to be a Gundam size.
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13
 Fate/Extra CCC - BB Matrix
Class: Moon Cancer
Noble Phantasm: Cursed Cutting Crater (C. C. C.)
Keyword: Advanced level AI, khakkhara of direction
Strength: ★, Endurance: ★, Agility: ★, Magic: ★, Luck: ★
Golden Grail: EX, Self-Modification: EX, Potnia Theron: EX
Cursed Cutting Crater (C. C. C.)
An attack on the world by BB in control of the Moon Cell.
Also called the spirit particle imaginary pit.
A world purge by means of event rewriting, making maximum use of the EX skill “Potnia Theron” BB had acquired.
The goddess who is the mother of the earth goddesses who created the earth is, in other words, the “root” that created all creation.
This Noble Phantasm is an anti-world Noble Phantasm that outputs information like an ultra-precise 3d printer and crushes the present world with the world desired by the user.
The space eroded by BB becomes imaginary space and a curse that consumes reality. CCC as the name suggests is a cursed pit that bores out reality.
In addition to scattering all objects inside on an atomic level and reconstructing them, it is capable of writing over and rewriting information of fields such as luck and coincidence.
While theoretical, it is also thought possible to distort the time axis by interfering with gravity fields and rewrite the law of cause and effect.
When used in combat, BB’s familiars, the shapeshifters engulf the target, and after turning into a sphere, is wiped out of existence along with the target and the dimension with it.
Normally, a structure in which value can be shared cannot be constructed in the far side of the world, which is imaginary space. What established BB’s internal world as the Sakura labyrinth was the power of this Noble Phantasm.
Advanced Level AI
An artificial intelligence configured according to their program. In this age, they are treated as things that "function as programs," but "do not exist as actual beings." In other words, things that "are" right in front of your eyes but "are not." They are merely a mechanisms for the sake of allowing human lives to progress smoothly.
As it is the same for the SE.RA.PH, they are virtual lifeforms that are created along with the commencement of the Holy Grail War and disposed along with its completion.
Within the SE.RA.PH. the humanoid virtual lifeforms are: the NPCs that perform only one task, AIs who have been granted the capability for self-judgement, and the advanced level AIs who have been trusted with the capability for self-judgement ad the management of a section.
Advanced level AIs are things created to efficiently promote the Moon Cell's primary objective of "human observation." As they are perfect reproductions of humans, they have been programmed with a at least a soul, but while the soul "is there," it is contents are still colorless.
The virtual lifeforms that the SE.RA.PH creates are reset with the round of the Holy Grail War. The NPCs and AIs return to zero, while advanced level AIs retain just their persona and their memories are reset--made to pretend that they never existed.
When the Holy Grail War is over, the one who is left alive is the Master standing at the summit. This is a fact that applies not just to the Masters but is also held in common by the virtual lifeforms that the SE.RA.PH created.
It appears that BB is an advanced level AI entrusted with managing the health of the Masters, the same as Sakura. However, as she is now rampaging for reasons unknown, the methods she uses to "manage the Masters" have become extreme.
Khakkhara of Direction
The teacher's pointer that BB carries. A device that allows her to use her use her authority as an advanced level AI to its fullest. There are restrictions from the far side of the moon, but with this, BB can revise the game rules (spirit particle laws within the SE.RA.PH)
The ten crowns of direction worn by the Beast of Babylon converted into a teacher's cane. This is due to the theory that the seven-headed beast is male, which opposes the theory that it is female; it's true nature is a phallus (an erect rod).
The symbol of the king of the world who was granted power and authority by a great dragon and, during a period of 42 months, spat as many arrogant words as they desired and had received the right to desecrate all things.
The beasts heads are the seven hills of the Roman Empire... Capitolium, Palatium, Aventinus, Esquilinus, Caelius, Quirinalis, Viminalis. In other words, it symbolized the Roman Empire itself, and those ten horns were symbols of... Augustus, Tiberius, Caligula, Claudius, Nero, Vespasianus, Titus, Galba, Otho, Vitellius... those emperors.
０１ - C. C. C.
０２ - 上級AI
０３ - 支配の錫杖
Golden Grail [EX]
The golden grail that BB possesses. The Holy Grail. The Holy Grail that grants its owner's impudent and selfish desires.
The grail that the great enchantress who appears in The Revelation of St. John the Divine holds. Though it's a counterfeit Holy Grail, it's because that it's a counterfeit Holy Grail that it's become a "genuine" Holy Grail that grants the desires of humans without paying heed to right or wrong.
To the Christians of those days, who considered honorable poverty a virtue, this grail, which was formed as a symbol of treasures such as gold, is no doubt the meaning of corrupt wealth, greed, and the vanity that leads one to adorn oneself.
Though it is clear on the occasion that this grail is held by the great enchantress of Babylon which in the personification of the Roman Empire, this grail symbolizes the wealth of the earth, which is the inversion of Christ's words, "Do not pile up the wealth of the earth."
"I saw a single woman astride a red beast. This beast, whose entire body was full of numerous blasphemous names, had seven heads and ten horns."
This is the description of the beast of destruction that appeared in the Holy City and the woman who was straddling this beast, according to the book of Revelation. A large beast with seven heads like a hydra came from the sea and disembarked toward the Holy City. This beast and woman, while two, are as one, and it is impossible to think of them separately.
It is said that this woman was born from evil, and those who are quick to anger, those who are greedy, cannot resist her allure and become corrupted by that grail.
This is a digression, but it is sad that the red Saber who claims the title of emperor was, after her death, was seen by believers to be on par with this beast.
A skill that allows one to restructure oneself. AIs created by the Moon Cell are under an absolute rule, "Improving one's functionality is not allowed."
However, BB, who had escaped that yoke due to her breaking down, began to expand her own functions. In order to boost her calculating power, she had that black noise prey on and dismantle NPCs, AIs, and finally, Servants, and utilized them as her own memory.
Though they were appendix-like additions that won't spare her from the fate of collapsing on her own, BB has changed into a hyper level AI who holds an enormous amount of capacity. Like the towns on reclaimed land that continue to build architecture while knowing that it will be swallowed by water or Frakenstein's monster.
Potnia Theron [EX]
Potnia Theron (Conception of All Animals).
The authority of the goddesses whom BB compiled and absorbed from the abyss of the mooncell.
What it is is the embodiment of the power of creation possessed by the mother goddesses, originating from a forgotten goddess approximately 8000 years ago (the goddess of Çatalhöyük), and branching to Tiamat and Cybele, Ishtar, Inanna, Athena, Astarte, Gaia, Hera, Artemis, Aphrodite, Demeter, Athena, etc.
Many are imaged with mural crowns. This is because many of the goddesses were also the guardian deities of cities.
The symbols of this authority are the holes opening in the earth and the sky (caves and the moon), the whirlpools and typhoons of the sea, the craters of volcanos, and so on, and from these, evils bringing forth all manners of death are birthed.
But once these evils have finished spreading death, they leave the promise of good harvest and fertility. This authority is none other than the power of bringing death as well as giving life.
The earth mother is a guardian deity revered by the people and their protector, and at the same time she is the sacrifice that feeds them with the crops born from her body and the beasts of the fields and the forests.
The earth mother feeds man with her blood and flesh, kills man over time and absorbs him as nutrition, and once again feeds man with her replenished blood and flesh.
This process is the circle of the food chain, and the cycle of life and death can be said to be the true nature of the earth mother. With this authority, most of the goddesses gave birth to countless monsters and giants and posed a threat to the gods and man, or they gave birth to heroes and became protectors of man.
Tiamat and Gaia are examples of those who became threats, and Hera is an example of a mother of heroes.
Those born on this earth cannot defy the authority of the earth mother, as that would mean rebelling against the system of life itself.
However, it is when they have left this earth to go into outer space and ended the infantile stage of intelligent lifeforms that they should no longer be bound to this authority..
The wish of Çatalhöyük is the coming of that day.
０１ - 黄金の杯：[ＥＸ]
０２ - 自己改造：[ＥＸ]
０３ - 百獣母胎：[ＥＸ]
Spirit Particle Imaginary Trap
Cursed Cutting Crater (Spirit Particle Imaginary Trap)
The official name of this stage.
The fact that BB had reached the Moon Cell core established this “place”, formerly imaginary space for storing malicious information, as real space in the present, past, and future. It was reconstructed at her hands as a “far side of the moon” where even Masters can exist.
BB attaining the power of the primordial goddess succeeded in quantifying the “nothingness” before the birth of life. She transformed into a master of imaginary space where time and space are indefinite.
While the Moon Cell can’t be hacked however much time is spent, BB was able to take control of it by placing herself in “unlimited time”.
02 The remnants of peaceful days
After the constraints to her free will were removed by Kiara, she was unable to control her status abnormality and went into overload.
As NPCs can only do routine work, they ignored Sakura while she was crashing down as being “non-existent”, and since the mooncell only performs a check at the end of the day in the preliminaries, Sakura was within an inch of termination.
(MC name) witnessing this called to her. Are you okay, he/she said.
The observation of Sakura “being here” by a third party helped her recover her close to disappearing unconscious, and the subsequent nursing gave her a clear ego of “wanting to be here”. Her self-destruction was averted.
What happened afterwards need not be said.
When the next day comes, everything will be erased by the mooncell. Sakura wanting to continue this one day miracle used her higher class AI privilege to repeat the day she came to know the MC for 69 days.
However as time passed, Sakura came to suffer from her self-contradiction as an AI and from the fact that she dragged (MC name) into this.
“The Masters participating in the holy grail war will all die, barring one exception. No, even then (MC name)…..”
Sakura continued to suffer from her desire to continue the loop for eternity and her feelings for (MC name)
The decision she chose ultimately was to seal the 69 days worth of memory, the love she acquired, so she could return to being a normal AI.
An AI cannot delete records.
Because of that, she moved the memory to a backup machine to reset herself.
Believing that to be the best choice for (MC name).
But even if the memories in the mind are lost, the memories recorded by the body continue to live. Though she had forgotten everything and was back to being a normal AI, she was shaken by emotional values of unknown origin every time she talked with the MC.
Meanwhile, the backup to which she moved her memory, couldn’t tolerate herself, and she decided her course of action and made her move as BB, the rebel plotting to destroy the system of the mooncell for a certain objective.
The timing she took control of the far side of the moon was between the end of the fifth round and the beginning of the sixth in real time. Four Masters who were not defeated yet, (MC name), Leo, Rin, and Rani, and the irregular exception Jinako were kidnapped to the far side during the war while they were still alive.
Matou Shinji, Gato, Julius were moved to imaginary space 0.00001 seconds before the firewall would have destroyed them after they were defeated, prolonging their flash of life.
Regardless, CCC is a dream by BB.
If the dreamer is no more, the world ought to return to a reality where nothing happened.
By the way, the everyday scenery in the prologue that (MC name) saw in his nightmare was an artificial paradise modeled off the discarded 69 days.
After pulling (MC name) to the near side, BB placed his digital body in the old school building, putting into a deep sleep and sealing him in a never ending dream.
Normally, he would have lived peacefully in the looping everyday life, but the strength of his bond with his Servant, or his own will rejecting the peaceful days caused cracks in the artificial garden and (MC name) came to notice something was not right.
In order to place (MC name) into deep slumber once more, BB reset the school building and tried to redo the dream, but the (MC name) escaped the reset and leaped into a deeper part of imaginary space
It was a depth deeper than the bottom of Id.
“The death of the collective unconscious” beneath the unconscious.
What saved (MC name) who leaped into a region even BB cannot affect was the voice of the Servant whose fate was shared with his.
Thus, the contract was sealed, and (MC name) woke up in the old school building left in the far side.
０１ - 霊子虚構陥穽
霊子 虚構 陥穽。
０２ - 日々の名残
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8
 Fate/EXTRA material - Character Profile: BB, p.102
- Height: 156cm
- Weight: 46kg
- Blood type: O
- Birthday: 2nd March
- Image colour: Black
- Talents: Routine work
- Likes: Games, junk food
- Dislike: Rear charge, blazing up
- Enemy: Kiara Sessyoin
- Height: 156cm
TYPE-MOON Ace Vol. 8 - Fate/Extra CCC interview with Nasu and Takeuchi, p.011-012, p.039-043
- ↑ Fate/Extra CCC- "if there were a girl BB was based on, she probably would have longed after someone like [Archer]"
 Fate/Extra CCC - BB Secret Garden
Name: BB (What it's short for is a secret. Call me however you like, Senpai!)
Height: 156 cm (I wanted to look at Senpai at the cutest possible angle. Though that's a lie.)
Weight: 46 kg (Mm, fufu. Unlike a certain stupid Senpai, I'm full of substance!)
3 Sizes: B85/W56/H87 (Fufu, I can feel a certain energetic Senpai's passionate gaze.)
Home: The moon (The original settings are for Japan, but I'm a genuine, 100%, from the past to the future, someone born on the moon.)
Birthday: (According to the settings,) March 2nd. (I'm looking forward to what kind of present a certain Senpai with poor sense will give me.)
Weak Point: (As the absolutely flawless, BB-chan,) I don't have anything like a weak point. (If I do, it's you, Senpai.)
Fetishism: Eyes. (Eyes, eye. Glaring, despairing, staring. Humans really are interesting.)
What do you seek from your partner?
Frankly, I don't want anything. (So just quietly stay in that corner without fail.)
Favorite underwear color?
(Do you want to see them? Do you want to know?) Of course, I won't tell you! (Huh? They're visible!?)
How do you spend your free time?
The hard-working BB-chan excavates the labyrinth every day without resting. (I'm utterly busy, digging and widening it!)
Generally, those who possess this attribute are considered to be a service-type character who, despite being in a position weaker than the protagonist's and having shallow experiences, gallantly put in the effort to support their senpai.
...There is no doubt that there is no mirror in BB's room.
According to BB, the reason she calls [the PC] Senpai is because she has this SG. Whether she is actually younger or even if she is even a student is dubious, but BB's tone of voice is definitely that of a kouhai treating a senpai with respect. If it has to be said, then "all-purpose-type kouhai (but seriously wicked)".
Well, either way, a kouhai who fires and strikes with her own SG, blasting [the PC] all the back until they are against a wall, can't be called gallant or anything.
Desire to Confine
The SG that BB acquired without even realizing it when she returned alive from the imaginary number space. It appears to be BB's second SG. An SG of the same type is "the desire to monopolize."
In regards to its true nature, it's an SG with a strong tendency toward unorthodox desires. "I want to lock you up." "I don't want to let you out into the outside world." "It would be best if all you had was me." What happens when such desires harden into specific measures.
The imaginary number space that she called the dog space was probably strongly influenced by this SG.
Inversion of Love and Hate
BB's third SG.
When deep affection, due to a certain impetus, changes into hatred. BB, even though she chose this rampaging path to save [the PC], she had this kind of dangerous facet to herself from the beginning.
Both her kouhai attribute and desire to confine arise from this SG. As there is no longer any point in hiding it, let it be plainly declared: To BB, who has a strong S disposition, there are occasions when affection comes to equal mischief.
She wants to bother the person she loves as much as she loves them. She wants to always have the person she loves be mindful of her.
These desires that were deep within BB are this SG's true nature.
A digression: Those BB Channels she repeatedly put on air are her own style of intense love calls, but as that went totally unrecognized, it seems that after the show's airing she would be come depressed all on her own.