I had the idea of an AU in which Grace is still a middle school teacher and he gives class to a girl named Ellie.
Ellie could have been presenting some problems, maybe she has issues socializing with her classmates, or has been showing some aggresive outcomes, maybe she speaks a little to much of human sacrifice and is freaking out the other kids, or just had some troubles keeping with the subjects.
Grace is trying to help her but he needs to speak with Ellie's tutor so they can work together to look for what is the best for Ellie. Grace cites Ellie's tutor to a teacher-tutor meeting, he send them a note or message with different times that could work and they end agreeing in a date and time.
The date cames and Grace waits for the tutor to appear. He waits...and waits and when he thinks that the tutor must have forgot the meeting, a man appear in the door.
He looks like he has been running, sweating and gasping for hair, his black hair all messy. Grace notices that the man doesn't have his left arm, and that the left side of his face is cover by scars too.
He seems nervous and agitated, looking around the classroom until he looks at Grace and quickly sits in the chair in front of Grace desk. The man presents itself as Simon.
Rocky would also be a teacher in here, maybe the STEM teacher or robotics. He is best friends with Grace, as it always should be don't matter the universe.
Adrian is also here, maybe working as another teacher, of music, or just working as a zoologist in other place.
Simon was part of the Cult of Eden, but he had wanted to leave for a while, it wasn't until the cult wanted to sacrifice a little girl (Ellie), that Simon took the girl and run away from the cult.
Ellie has the bad habit of biting people.
Simon lost his arm and gain his scars when escaping of Eden with Ellie.
They could be in witness protection, and maybe Ava is their contact agent.
Simon could literally be a butcher.
Simon is a new unexpected single dad.
Ellie is a menace to the world.
Grace is trying, really hard, to be profesional.