[X] plan desperate hope
-[X]The situation is not yet unsalvageable. Talk to i-her. Ayin's past taught you what poor communication does to people, and how to avoid making the same mistakes. There has to be a way for everyone to get what they want. Negotiate via Attachement work and gather information
-[X] Ask her to let you go through with the Lobotomy session. Not to take any of the Soul Gems away from her, but to make sure they aren't being harmed or at risk of dying.
-[X] Gather as much information without triggering Nothing There's aggression, during lobotomy gather as much information as possible and figure out their plan
-[X] if you can not reach a good agreement, reluctantly accept and wait until you are strong enough to suppress them
-[X] Set the various souls to some sort of hibernation if possible and ask nothing there to be careful not to hurt or break further
-[X] find substitutes for the soul gems if at all possible, even get kyubeys help
-[X] backpedal on the 'i could help make you human' comment and apologize for it. Claim it was insensitive and based on preconceived notions of what Nothing There was like in the facility.
-[X] Nothing There is for all intents and purposes, a child. A very powerful child trying to understand the world and how to fit in with those around her. She is absolutely a person. A human, even if she doesn't have the shape of one, or a full understanding of morals and societal expectations. So now... Her next step should be to solidify herself. Learn what she wants to do and be now that she's 'won' her main battle. Help her with it where possible, Treat her as a child, as human, and teach her. Especially human biology, psychology, morality and developing her own identity as a person. First Step a Name, not just an Epithet but an actual name, and what pronouns they wish to use
-[X] politely accept nothing there's offer to be an employee but decline her hecoming kyouko and find some way to gently break the truth to the others via telepathy afterwards and ask them to not attack and for them to simply treat Nothing there as a particularly volatile magical girl who is in desperate need of help, then Properly introduce them by inviting them in with Nothing there's permission, Yuma First then the others
edit pardon my plagiarization, You could put this to words I could not
..... this is the best I can come up with
at this rate I wonder whether the white rat engineered this exact situation just to get us to WISH
IF SO I ADVOCATE FOR LOBOTOMIZING THE RAT