BB

A special case that arose within the Mooncell Automaton. Originally a high-grade AI created to monitor the Masters' health, a bug in the system caused her to go out of control.

As the cancer of the digital world, she rules the far side of the moon. She is the digital demoness who interfered with SE.RA.PH's Holy Grail War. While she forced the participants of the Grail War to abide by the rules, she herself, being the illegal meddler that she is, broke all the rules.

While she doesn't bat an eye at the notion of destroying the world, she commits herself to being the best precocious little kouhai to her senpai (Master), wrapping them around her little finger. A devilish heroine.

"Prim and proper battles are so boring, don't you think? I want to see everyone suffer even more!"

At first blush, her action and personality parameters seem completely out of whack...but that's just BB for you.

Height/Weight: 156cm, 46kg

Origin: Fate/EXTRA CCC

Region: SE.RA.PH

Alignment: Chaotic-Good

Sub-Attribute: Human

Gender: Female

"I actually wanted to be a Ruler, but I changed my mind. It'd be like being a Game Master who's tied down by rules. That would make me a mere machine. In the name of love, BB is gritting her teeth so humanity can suffer!"

Her words are wicked and spirited, and even if she fumbles her speech or mannerisms, she keeps on plowing ahead. She is the girl pulling all the strings from behind the scenes.

Normally she is a timid girl who seldom takes center stage, but she becomes incessently active for the sake of the one she loves.

She enthusiastically plays the role of villain, but since she doesn't really have any knowledge or experience of such things, she can't help but mess up her lines sometimes.

She is aggressive because she has a latent tendency toward sadism. This is the source of her "little devil" persona.

In addition, she is the type of girl who holds back everything until all her built-up frustrations explode at once, so when that happens, she demonstrates horrifying ultra-sadistic behavior.

While she is playing the bad guy, she is on a high, saying things like, "this is SUPER fun!" But once she's all done and reflects on her behavior afterward when she's alone, she holds her head in agony.

Though she was the one who created the low-ranking AIs, the Alter Egos, to be her minions to help out in her work, she has terrible relationships with them.

There's a reason for that: the Alter Egos are not simply copies of BB's personality but rather AIs that were created based on her personality. This means that each of them has very different opinions from their source material, BB.

That is why Meltryllis and Passionlip are not avatars, but Alter Egos.

『C.C.C.』

Rank: A

NP Type: Anti-Personnel

Range: 1-10 Maximum Targets: 1

Cursed Cupid Cleanser.

BB once wielded a Noble Phantasm called the Cursed Cutting Crater: Spiritron Virtual Trap, but "I used that thing way too much and I'm sick of it. The theme for this event is cute and curing! Oh, but just because I'm on everyone's side this time around, I'm not taking back the 'cursed' section. BB's curse is eternal!"

And that's pretty much how she just made up a bunch of junk for a new move.

She draws out the power of the Mooncell to change into an invincible nurse's outfit. From there, she pulls out malignant information from within her Void Space and overwrites the surrounding channels (common recognition memory) into a chaotic mess.

She rolls out the Reality Marble "BB Channel, Travel Ver." and beats everything into a melting pot of chaos. At least that's what she claims, but really she just changes into Nurse BB and pokes the enemy with a syringe.

Domina Cornam: EX→D

A super cheating skill on par to a god's Authority.

Domina Cornam, or Ten Crowns, refer to the ten evil kings, while the seven hills point to the loathsome evil city.

In simple terms, it's a skill that can make any injury or event outcome as if it had not happened.

As long as she has this skill, BB is virtually invincible.

Just kidding. That's all in the past.

You know, an invincibility cheat is just shameful.

This is a skill unnecessary for the beautiful and cute BB this time around☆ Oh, but you can use it a little bit. See, like this!

Self-Modification: EX

A skill that modifies the self.

Within the Mooncell's AI, there's a cardinal rule that forbids the improvement of one's functions.

But BB escaped such constraints after she broke down, and began expanding her own functions. To upgrade her calculatory abilities, she used her black static to capture and analyze NPCs, AIs, and even Servants and used them to expand her memory.

Ignoring the risk of self-destruction, she expanded by adding more and more to herself. As a result, BB turned into an ultra-grade AI with an expansive volume. She is like a city built on a landfill that continues to add buildings even while sinking into the sea, or perhaps Frankenstein's monster.

An AI that has gone rampant, causing "Case CCC."

She was a supervising AI in the infirmary, but a bug in her command system for self-preservation went out of control. For some reason, she came to the conclusion that "anything can be sacrificed if it means self-preservation." She then became a continuously growing monster, absorbing NPCs, Servants, and Masters.

She declared that she hates humans, and dragged one Master to the far side of the moon to torture. Her actions are normal to her, but from an objective standpoint, she's obviously insane.

Even within her own words, contradictions such as excessive love or a mixture of love and hate are easy to spot, but for a full explanation of the cause of those contradictions, you'll have to refer to Fate/Extra CCC.

Her Luck parameter was the lowest rank, E-, but through efforts (and self-sacrifice) extreme enough to literally twist the world, it became EX.

In other words, she once caused a miracle that only someone with EX-ranked Luck would have been able to achieve.

When FGO Kiara and CCC Kiara merged, the Mooncell temporarily made BB a Servant as a countermeasure and sent her to the FGO universe (BB, as a user of Void Space, was best suited to subdue Kiara).

Thus, while being a replica of the BB bug, BB was able to act within Seraphix as an autonomous cyber life-form.

The BB who appears in the FGO universe acts just like the little devil of the CCC incident, but to her it feels like that particular experience happened tens of thousands of years ago.

Additionally, she is aware that she is only able to be a Servant in the FGO universe, and does not exist in the original CCC universe. She understands that she is a one-night-only illusion.

BB considers herself not so much a tool for humanity's salvation as a devil who sometimes leads humanity astray and sometimes helps them out.

"That's why it's futile to fall in love with me, okay? No matter how much you fall head over heels with BB, I will never be caught♡"

...Is what she says, looking smug.