I think they could even keep Chester's whole mechanic if they just made him, like, 10 times slower. I mean, characters like Toy Freddy are super slow at 13!
Maybe one day do some sort of circus challenge with the pinwheel circus characters from FNaF World and the Dark Circus AR (including Ballora) characters and maybe a few other characters who look like they would suit being in a circus. From Sister Location, don't add all the characters from there, maybe just add Ballora and CB but for the other SL members, just add who you want if any To be more specific, I would say to include Ringmaster Foxy, Magician Mangle, Clown Springtrap, Baby, Circus Baby, Virtual Circus Baby, Prototime Baby, Redbear, Tangle, White Rabbit, Ballboy, Browboy, Security Owl, Gold Endo, Bubba, Ballora, Holographic Ballora, 8-BIT Baby (optional), Ennard (optional), Fruitpunch Clown (optional), Lemonade Clown (optional), Grunkfuss (optional), Elenor (optional) the optional characters can be if the challenge is too easy maybe also add any other circusy characters if you want