Shed 17/Project G-1 and the FNAF Story(but especially the Novels) actually have a lot in common in terms of the lore.
You have a budding young scientist experimenting in a new field (Henry Emily in FNAF with animatronic technology and Whilhelm Gotz and his father in Shed-17) who has a child that suffers a horrific death at the hands of their passion (Charlie being killed by a man in an animatronic disguise and Thomas being hit by a train), which the distressed parent rivives using their passion (Henry recreating Charlie's concious in a series of animatronics, The Gotze's biofusing Thomas into a train) before eventually killing themselves over the combination of guilt from the tragedy AND their technology being used for malicious reasons (Henry after learning of what William had done and Gotze after The Fat Bastard begins misusing his technology)
Afton sort of has elements of both the Fat Bastard and Owen Routh(Taking control of the company to push his own desires no matter the cost, just like The Fat Bastard, and both are implied to be after immortality), but Owen Routh is definitely the closest analogue to William, both being men of science driven by their desire to use the technology to acheive their ultimate goal, no matter how many innocent must suffer in the experimentation (Routh's work with HIT Logistics to build the ultimate Bioweapon by melding biofused matter together, Afton's work with Afton Robotics to build murder robots to study remnant and acheive immortality)
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