Fazbear Entertainment Stole Everything
So in Secret Of The Mimic bit by bit we see stuff created by Edwin Murray in which Fazbear Entertainment seemingly had taken for themselves. Mr. Helpful became Helpy, an orange and purple elephant costume became Orville, and Maestro Music Man became Music Man.
As we go on some of the themes of the original FNAF game and one that has been seen alright throughout the franchise begins to rear it's ugly head. For example, FNAF 1 you had the covers up of deaths and the pink slip firings for absurd reasons. In Pizza Sim you have all the ways Fazbear Entertainment has to deal with the player character, which is being run by Henry keep a pin in this. Overall a theme of your typically corporate greed and abuse of workers. Which we see in this game with while Edwin does it to others at times, Fazbear Entertainment does it to him putting him in debt and taking everything, and I mean everything. With William and Henry working together to actively sabotage the Fazbear project by changing things, and using moles to poach his employees.
Later on we eventually find out that Foxy and Roxy were both characters created by Edwin as puppets for shows and weren't the creation of William or Henry. By extension we see that Edwin's company created Chica who was used in Chica's Party World. But then we eventually get to see how much they actually took from Edwin.
Throughout the game we hear mention via recordings of a Fazbear Project, a project Edwin helped work. And then we get to see the full extent of what was taken. We come across a room strikingly similar to the FNAF 1 location with prototype animatronics which include Freddy, Bonnie, Chica, Foxy, and Monty. Alongside this we find prototypes for Fredbear and Springbonnie which are springlock suits, and earlier in the game we learn that Edwin was the one who created the first springlocks which is used earlier in the game. Meanwhile Henry was using inferior copies that couldn't withstand water and fall damage like Edwin's could.
So not only did Fazbear entertainment take all the characters Edwin had created from him after drowning him in debt, but all his technology from the springlock suits to what would become Fazwrenches.
Now you may think, well maybe they at least came up with Freddy/Fredbear and Springbonnie/Bonnie. They didn't. So in the prototype FNAF 1 location you can find a recording made by Edwin that says the following. "Are they insane? The look of these new animatronics is Fiona's design and they're great. First they approve the art. Then they approve the proofs. Now they change their minds when we're so close to final. Why would they change them now? Are they pulling my leg? The new concepts are frankly creepy. It doesn't matter… I'm not changing a single bit of her work, and they can't make me." This implies the animatronics are all designed by Fiona and by extension all the characters were designed by her.
This actually means while Henry tries to take credit for the animatronics creation in the Pizza Sim, he is a liar. Both him and William stole everything from Edwin. None of the characters or technology are theirs expect maybe Freddy/Fredbear and Bonnie/Springbonnie. But again the designs aren't their's. Written by Eris
