In some ancient civilizations the Wolf was a symbol of the underworld. In Egypt, the guardian of the dead was Anubis who was a wolf-headed god. The jackal portrayed as black was the symbol of both death and regeneration.
William is also the one who hid inside the suits and kidnapped and killed children, leading to the assumption that William Afton is The Purple Guy of FNaF 2 and 3 (he is killed at the end of the book when Charlie sets off the spring locks in his suit).
We know that FNAF 2 takes place in 1987 But we don't know the year of FNAF 1. And FNAF 2 comes before FNAF 1 (Becaz phone guy is still alive at FNAF 2 but he died in FNAF 1) Phone guy said that: If i sing those stupid songs for 20 years i will be the same. We know that Bite Of 87 happened in 1987 (How strange) Do a simple calculation and calculate 1987+20=2007. FNAF 1 takes place in 2007.