Mainly based off that vr. Imma say all the characters whether from the same origin game or not interact in the hub of the vr world. Character list is subject to change

Evan: Freddy
Bonnie: Delirious
Foxy: Tyler
Chica: Craig
Golden Freddy: Vanti
Toy Freddy: Brian
Toy Bonnie: Nogla
Toy Chica: Panda
Mangle: Bryce
Springtrap: Elizabeth
Nightmare: Luke
Baby: Alice
Funtime Freddy: Brock
Bonbon: Lui
Funtime Foxy: Smitty
Ballora: Marcel
Ennard: Ohm
Glitchtrap: Madison

No idea of a scenario but have fun