I'm just saying a Sonic AU of Para//èles (English: Parallels. Great show. HIghly recommend. I watched it on Disney+) would go so hard. Here, let me give a rundown of my ideas/the show:
Sonic, Tails, Knuckles, and Amy are Sam, Victor, Bilal, and Romane. Sonic, Knuckles, and Amy are the same age. All four are in the same grade, but Tails purposefully failed because he wants to be with kids his own age and make his own friends and stuff
Sonic and Tails are brothers. Sonic is the favorite kid because he's social, athletic, kind, etc. Tails has a complicated relationship with their parents because he's a genius and they don't quite understand him
Amy is Vanilla's child, and Cream is her younger half-sister whom she absolutely adores. Cream's father (so, not Amy's) has come back into their lives, but he's a piece of shit. Amy is holding her tongue because Vanilla loves him and Cream deserves a father
Knuckles could be Tikal's kid. Or maybe she's just his older sister whose raising him after their parents die
The story begins with Knuckles' birthday. The four friends go to a semi-underground room beneath a dam to celebrate. When the clock strikes midnight, a strange event happens that leads to branching paths
For Sonic, everyone he knows disappears, replaced with a strange, old echidna. He runs away from the echidna to call the police, hoping to find his friends and brother. The search doesn't bear any fruit. They have well and truly disappeared, leaving him completely alone in the world
In another parallel reality, Amy and Tails are the ones left behind. They wait for Sonic and Knuckles to return. By morning, they come to terms with the fact that they're never coming back. Their lives continue with this knowledge. Amy works hard to support Vanilla and Cream and protect them from Cream's father. Tails is sent away to boarding school because his parents never understood him and blame him for Sonic's disappearance, causing him to develop a more 'Nine' personality
And in yet another parallel world, Knuckles was the one left behind. He lives his life all the way to adulthood, eventually starting a family. When he and Tikal figure out what happened, he tries going back in time, only to end up in the reality where only Sonic survived. He tries convincing Tikal that it's him. That fails, but he does manage to convince Sonic of his real identity
Like Knuckles, in Amy and Tails' timeline, the latter starts piecing together what happened. He's determined to get his brother back. Amy doesn't believe Tails, but she needs something to believe in after Vanilla dies and Cream's dad threatens to take the girl away from Amy. Together, they, too, end up in Sonic's reality as their older teenage selves (18/19). They are able to convince Tikal it's them, and then they're all working together to make things right and return everyone to the right reality where they all exist and get to grow up together
Side-note, there's a plot-thread of this event happening in the past in the show. My idea is that several years ago, Marine was lost to a parallel reality, leaving Blaze all alone
Alterations I would make: Ship and let ship, I always says, but I personally don't ship Knuckles and Amy, so yeah, in his timeline, it's only him. Instead of nuclear power and stuff, the disturbance in space-time is caused by experimentation on the Chaos Emeralds, which is how Tikal would fit into it. She's not a 'scientist,' exactly, but she is an expert on the Chaos Emeralds