Many Hololive members, have deep background lore, origin or reason as why they are who they are. While FuwaMoco sisters… they are just dogs.
Partially inspired by Fuwawa hospitalization because of her injury. Plus what Nerissa Ravencroft said.
...
"Welcome! We had arrived at AbyssGard doggy knell."
Well, its not actually a knell, a small dog sized shelter, that look like a wooden house, but an actual residence for humans that got that nickname. Someone come up with it on a whim and it eventually stuck to point that even its residents start to use it. As was mentioned, this is a home of two twin sister: The fluffy Fuwawa, a curvy airhead big sister with sister complex and knowledge how to cook with a love. And fuzzy Mococo, a slim energetic younger sister with a codependency on her sister, showing up actual mathematical skills.
Anyway, blue themed sister Fuwawa returning home from hospital, kicked the front door wide open, happily shouting on entire room while making a dance like introduction move. "Moco cha~an!! [Mogojan]; Guess what?! I am ho~ome!! You bellowed big sister, has returned to you!"
Her younger twin sister Mococo in red theme, causally shows up from a corner, to show a warm welcome, with a smile on her face. "Fuwawa, you are back!…" Then she noticed that her sister carry in her arms, something warm and squishy, wrapped up in white blanket. "Oh?… whats that? A whole bread?"
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Blue sister, had on split of second a blue face, from facing the (ignorance of obvious) filter on her sister. But after a little sigh she lit up, because that was also a lovable part of her sister.
Filled with enthusiasm, Fuwawa shorten the distance between them with a dance like moves.
As she stand in front of Mococo, using her charm, she gently push that pouch into younger sister arms. While radiating a fresh mommy aura, holding her blushing cheek in her palms, and wiggling her body in embarrassment, that she need to say it aloud to a confused daddy. "Moco cha~an, this is the product of our love. An addition to AbyssGard family named little Rififi. In other words, the child we having together." She make this innocent soft giggle.
As expected, red sister was dumbfounded, with (I don't get it!) expression all over her face, as she failed to look down at what is in her hands while staring at her older sister. "Aeh? [What?] What are you talking about?" She even tiled her head. "Rififi? Aeh? That's the name of our dinner today?" As if on command, her stomach made this loud hungry groan.
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It was a quick moves from Fuwawa as she swiftly take that package from her sister hands. While she was holding that supposed baby in one hand, the other hand reach onto corner of her clotting, reaching out a sealed pocked with (Emergency MCC snack.) label. She pulled out a wraped-packed chocolate-snack-bar, that had such high preservatives content on it, (like sugar and salt percentage), that it was labeled: (Expiration date: None!). With a skillful move of her fingers on single hand, she half unleashed the tasty bar from wrapping and delivered it directly to her sister opened maw.
As the snack half way stuck out of maw, It worked as charm. When the taste kicked in, Mococo radiated calm happiness and satisfaction, as the urgent crawling had been defeated.
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Older sister release a sigh of relief. "Moco chan, this is not a cat." Returning her attention to the white wrapping in her arm, speaking gently to it. "Oh don't worry Rififi! Moco chan was only jesting. It was a joke out of the shock."
Only now the younger one try to paid an attention to the wrapping. With the snack-bar in her mouth, she lean closer to take a look, and other sister allowed it.
It was a baby version of them, like a copy pasted version of the AbyssGuard sisters, but toddler version. The little person stared at the slim sister with fully open eyes in (Whats that?) expression.
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Blue sister was once again in a mommy mode, presenting her child to papa. "Rififi, this is Mogojan. [Moco chan] Common Rififi; say Mogojan! Or a daddy. Da~addy." She giggle again as the baby don't get it, look at Fuwawa and tilted its head.
Whoever, red sister give the older one, (I don't trust you! What are you plotting?) stare. But with the snack-bar in her mouth, she dint say anything.
From second to second, it look more like if Fuwawa, introduced a third sister in disguise onto AbyssGuard family. Or she got a cousin to care for a day. But clearly,… some kind of a foul play was on place.
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Blue one, clearly tried to sway the situation by giggling.
But the red one was set on, not to be tricked on this gig. She continued to stare on her older sister while slowly munching on the snack-bar without touching it with her hands. It was like a battle of wits of who will break first.
Then the baby tried to reach out its tiny hands toward Mococo. No!; It was toward the snack.
That break the stall mate as both sister look down at the little one.
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Fuwawa was first to react. "Oh? Are you hungry, Rififi chan? Do not worry, I will make something for you." She make a pause, because this little one cant eat anything solid yet. "Like a milk?…" Then her eyes sparkled with an idea, of teasing. "Directly from the source? Only if daddy Moco chan allows it." She make a giggle as direct reference, toward her other half.
But the other sister dint laugh. She mumble (So you have a milk in those?) and give her sister blooming chest a doubtful stare. Of course this was a direct confrontation and fluffy one froze with guilty smile on her face. But Fuzzy one glanced toward the entrance door that managed to close itself. She mumbled (Somebody is camping behind the door.)
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Blue sister went into panic. "Mogojan I swear. I don't steal this puppy. Everything is legal and… and… And I have the papers."
Yet Red one boldly went toward the front door and opened it.
As expected, a person was standing there. It was a third sister of the triplets, Mofufu. In strong yellow theme and wearing an iconic french clothing with beret cap on top of her head; she was both handed holding this large suitcase/ trunk by its handle. We must note that she stayed there nervously, sweating, collecting the inner strength, the inner resolve, to make the final step and reach out for the bell. This was the moment of reunion with her younger sisters, after her return from long studies in foreign land, and she dint wanted to blow it up.
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Yet yellow sister panicked a little, as the door got unexpectedly opened, and the duo stare at her. After a few second of panic attack, she grab the resolve and spoke up nervously. "Hi- hi Fuwawa and Mococo. Its me, Mofufu. I- I am back."
At this point the sugar rush from the chocolate snack, hit the red sister and she suck the bar inside her mouth, so the wrapping fallen down. In response her eyes start to shine and her tail got wiggling from side to side quite fast. Clearly she just give up and got hipped up. "A new hidden sister?? A~awesome!!"
Except blue sister had silent terrified expression with her tail bristling, every fiber standing, giving the spiky fashion. And her mind was on overdrive with a though. ("Oh no! A new rival for me! And she,- she is a French! No French greetings [kisses] with Moco chan!") She got worried because of the cultural trope from movies where French greet each other with a kiss. But in her mind of house maiden in love, she imagine that the welcome gig, can skip the flirting part, moving directly onto adult romance.
Then the little baby rise its voice for attention, and the trio redirected they attention to the little one.
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Mofufu release a deep sigh, finally calming down. Then she make a gentle smile. "So the time has finally come. I guess that both event can be a quite confusing, coming at same time as it was predicted quite long ago. I will explain to you, how Kerberus work. But first, lets catch up first. Shall we?"
After both twins exchanged a confused glance, they without a word stepped aside and invite the yellow one inside.
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As Yellow one, went inside, excited, she asked them an important question. "By the way, why did you two moved out from previous home? When I went there, they tell, that you two suddenly disappeared one day."
Bot sisters got confused. "Eh?" "Aeh?" Instead of telling that there was a silly coincidence, they come with clever punch line. "We answered a calling." "Yeah!"
And that's how the legends of Kerberus reached out to others members of Hololive.