Chaotic Hivemind that devours lore

1.) Chachamaru Karakuri (Negima)

Chachamaru seems like the easiest to make as she seems more like a spare body then the rest that Penny just altered similar to Fortuna. The irony being that Chachamaru would be much more nutural a indidviual then Fortuna mainly do to the idea that she cannot produce her own Aura but would also need it to function.

Basically in Negima Chachamaru required someone to feed her magic through a sorta Winding Key (Like the sort on Wind-Up Toys) Chachamaru would work similarly here but with aura. Penny would be the one initally feeding her aura which makes Chachamaru dependent on her... Also note using too much magic during said process became arousing to her so the same can apply in this AU with Aura.

2.) Jenny Wakeman AKA XJ-9 (My Life As A Teenage Robot)

So this one might not actually end up as a sister, more maybe a Sister-in-Law. Lets say Dr. Wakeman gets involved with Pietro. When introduced to Jenny, Penny becomes ecstatic to have a sister.

She then hear that Jenny is solely a machine, since Wakeman can't exactly tear her soul like Pietro did... Penny would proceed to try awakening her aura... Maybe it works, maybe it doesn't if it does it's more cuz Penny whose soul is combined with her AI manages to copy said phenomena that or she recruits Jaune in a desperate attempt to make her new sister a person.

Of all the models here XJ-9 will obviously look the furthest from her canon series apperance. For rather obvious reasons as I'd want her to look somewhat natural beside RWBY charaters.

3.) The Twins (Atomic Hearts)

These two would be simple enough as I would make them be Watts former Assistant droids. Customized by the man himself and created to be appealing not for any peverse reason but simply to stoke jealously in other fellow scientist. When he left they were abadoned.

4.) Eve (Stellar Blade)

Honestly Eve is kinda a brain scratcher as she is obviously MORE advanced then Penny and I can defineitly see her having a soul. Perhaps she was created in a facility similar to Arrowfall that was ran by a AI since that sorta fits with her actual creation after all.

5.) 2B (NieR: Automata)

You know 2B kinda fits the same narrative as Eve and could simily be a second android the AI facility made. The only real issue is if it could make them why would it only make two? Maybe the resources to do so where just that huge that it physically could not create more then the two drop dead gorgeously sexy pair...

6.) Kos-Mos & T-elos (Xenosaga)

These two, if I were to make them I would actually have it relate to Watts again. But in this case T-elos would be created by him after he joins Salem. The Immortal witch wanting a servant who would never die to age and Watts would obey.

One idea I can see is that Salem preserved the body of a Maiden, and though she was dead her body could still prove useful for Watts who used it to make a Android to supass Penny (Because nobody should have a creation more powerful then his own) this would be T-elos. (In Xenosaga T-elos is the body of Mary Magdalene so this can somewhat reflect that)

As for Kos-Mos who is supposed to be the concious of said body of T-elos well, the Maidens don't all out die after all their power and possibly even part of their soul goes towards the next one.

Fria could sense this and since the Maidens have magic which is implied to be more powerful then Semblances I don't see why she couldn't do something similar to Pietro and simply cast off the part of the soul related to T-elos's body... In fact this would be a great explaination for how Ironwood got the idea for the soul transfer machine. Maybe he saw or was told by Fria how she cast said soul into a droid... Said droid would then be modified and upgraded till it became Kos-Mos....

again these are off the top of my head so feel free to make suggestions of your own.

7.) Curie (Fallout 4)

So yeah, the end resulted in a face I'm not entirely content with, one way or another, because I had to choose between the sharper ones from the Visual Novel or the softer ones from the anime, so I tried to go a nice, even ground.

While I'm not completely content with it, I do think I can live with this look got her though I might dabble with it some here and there. Not gonna lie most my knowledge regarding her comes from the Anime as I only just finished Volume 1 of the Visual Novel and that focused more on Chocola and Vanilla then her.

Coconut and the other girls would be adopted by the Arcs, one idea I like for this one is we use the old trope of Jaune's sisters teaching him less then masculine hobbies so Jaune picks up baking and would use it to help make money for his family (Alongside some of his older sisters) Coconut and the other Nekos would work there until finally their all sufficent for Jaune to attempt to leave to live out his dream of being a Huntsman...

And he managed it! Yes! Hurray! Awesome!... Until about a month in... Why was there two boxes delivered to JNPR's Room... Crap Jaune recongnized that voice and wherever Chocola went he knew Vanilla followed...

I like the idea that the Nekos presence makes Jaunes dynamic with two people change vastly... Weiss and Blake.

Weiss, being a racist, will very much rub on Jaune's bad side and make the Sass come out.

Weiss: Those two snuck there way into Beacon, see Criminals the lot of them.

Jaune: *Eyes Narrow* Last time I checked Schnee you left me in a tree to die during Initiation, so I don't think you got a leg to stand on when it comes to morality. Now you can either apologize to Chocola and Vanilla for being rude and prove you're not Daddy's little Carbon copy.

Weiss: Did, did you just refer to me by my last name?

Jaune: Come on chocola, Vanilla, team lets go to another table, don't wanna risk our food turning as 'spoiled' as the Ice Queen...

The other is Blake, with whom Jaune comes into conflict because she is constantly trying to change them to be what she feels a respectable faunus should be. Jaune thinks they're nothing wrong with how they wanna act if it makes them happy.

It's not like Jaune likes treating them like pets but they've all somewhat adopted that sort of mentality over time. Demanding pets, to be spoiled, played with (Similarly to cats)

Besides while he appreciates Blake's avid support for Faunus rights, a human has no right to tell a Faunus how they should behave If his sisters (NOT CATGIRLS, PETS OR NEKOS, no matter how much they insist on being called it) wanna act more attuned to their natural Faunus instincts, that's their right and he will fight tooth and nail for it.

Jaune: Also, Blake, don't call Coconut a Cat Faunus, she is a Maine Coon Faunus, you can obviously tell the breed by her large fur-filled ears and fluffy tail… grouping all cat faunus together is honestly Demeaning.

Blake: *About to have an aneurysm from sheer rage*

Blake also might be a tiny bit, microsphically so... jealous of the catgirls not that she would ever admit it. Once Neon shows up on the other hand, well she has much less shame and pride.