ALL THEORIES IN THIS POST WERE MADE BEFORE SISTER LOCATIONS RELEASE!
THE FUNTIME ANIMATRONICS (THEORY CONFIRMED) In FNaF World, unbroken Mangle is called Funtime Foxy which could mean she was apart of the Funtime animatronics. If she was apart of the Toy animatronics then she would be called Toy Foxy. This could mean that the animatronics in FNaF: Sister Location could be Funtime animatronics and Mangle/Funtime Foxy could be in it. Could this mean that the Sister Location is literally the opposite gender? Could the animatronic on the new teaser be Funtime Puppet? The female puppet? Another thing to point out is Mangle in the sisters room in FNaF 4. We don't know how she got there and why she is mangled but maybe it was a hint! Maybe Scott purposely put Mangle in a SISTERS room because he was hinting about Mangle in the SISTER location!
THE PINK GUY This is a theory that I've been thinking about lately. Basically, if FNaF: Sister Location takes place in the sister pizzeria then wouldn't the animatronics there have to be haunted too? So maybe the Purple Guy is over at Freddy's and the Pink Guy is over at the sister location and he also killed 5 children at the sister location so the children haunted the animatronics. Unless somehow the Purple Guy got into the sister location and killed more children, jeez.
Well those are just 2 theories I thought about and i'm sure you have one too so please feel free to share it with us and maybe I might just put it in an article like this! Thanks for reading!