EEEHEHEH thank you so much for the compliment!!! 🥰🥰🥰
And I'll give you a quick rundown on everyone's feelings immediately after Shadow brought Stellar home!
Rouge was the first to know, as she was actually present when Shadow discovered Stellar. The two of them had been tracking some leads about Project Stellar for a while, not realizing they were stumbling upon another attempt at Project Shadow until they were right on top of it. Rouge initially tried to reason with Shadow, recognizing his anger instantly and trying to convince him to let cooler heads prevail. She even tried to warn him against removing Stellar from her stasis pod, fearing that it was acting as some kind of life support and would kill her upon removal. Shadow decided to remove her regardless, deciding that either way, a life in the government's hands as a weapon was no life at all. Still, Rouge convinced him to take her straight to Sonic—and, more importantly—Tails, since he had the tools at his disposal to give Stellar a proper look over.
Sonic and Tails live together, so they were the next in line to find out. Shadow basically showed up looking like he was out for blood with a baby in his arms, demanding that Tails use his equipment to see if she was okay. Tails and Sonic both wanted more of an explanation (like, where did you get a baby, WHY do you have a baby, why do you look like you just got out of a fight, etc) and Shadow would begrudgingly tell them what he'd learned, clearly deeply uncomfortable with the entire conversation.
Well, to say they would both be shocked would be an understatement. Sonic would be at a loss for words, for once. Tails, ever the scientist, would immediately want to look over Stellar to see if Shadow was telling the truth. By the time Shadow had handed the baby over to Tails, Sonic's brain would have rebooted and the motor mouth would start up again.
He'd be in total disbelief, really. He'd just start yammering on about every question and concern that would come to mind.
"The government tried to make another you?? With ME?"
"Does that make me a dad? Does that make YOU a dad?? ARE WE DADS??"
"I can't take care of a baby, I don't even remember BEING a baby! What do babies even eat??"
Etcetera, etcetera. Shadow would just stand stiffly in a corner of Tails's workshop, laser focused on whatever tests Tails would be running on tiny baby Stellar. He would totally tune Sonic out, instead focusing on the barely noticeable rise and fall of Stellar's chest, petrified that she might stop breathing if he looked away.
Honestly, the first night would be VERY tense. Shadow would still be high strung from the rescue, Sonic would be trying to wrap his head around the whole idea, and Tails would be devoted to running all the tests he could on Stellar to try and get some answers.
Tails would determine she was healthy, showed no signs of requiring any kind of life support, and was definitely Shadow and Sonic's biological child. Half Shadow's DNA, half Sonic's.
He would also realize in his tests that her energy readings were off the charts. Whatever they had been cooking up in that lab wasn't good, and Stellar was almost like a living chaos emerald. He'd immediately be concerned about the implications of keeping her around, but Sonic would have come around by that point, deciding there was no way he and Shadow would be getting rid of her.
Shadow wouldn't be so sure. He'd suggest talking to Rouge, Amy, or Vanilla about being a mother to her instead, since he wouldn't be confident in his own abilities to raise a child. Sonic would be annoyed by that, pointing out that it would be pretty messed up to try and pass her off on anyone else. Vanilla and Rouge both have their own kids to worry about, and Amy lives in the Sol Dimension with Blaze most of the time. He'd reason that they should at least try. Besides, who could possibly understand her more than Shadow?
Eventually, they'd agree to try raising her as a team. It'd be a begrudging decision, but one they'd learn to live with. The two of them wouldn't be romantically involved at this point, either, so the two of them had a LOT of growing pains trying to figure out how to parent together. Getting a baby government assigned to you is one thing, but having to raise it with your rival is another!
Oh, and as for Amy, Knuckles, and the rest of the group? They'd almost all be horrified LOL! Stellar definitely received a rocky reception at first! They all grew to love her eventually, though.