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).
The Color Purple is a 1985 American period drama film directed by Steven Spielberg and written by Menno Meyjes, based on the Pulitzer Prize-winning novel of the same name by Alice Walker. It was Spielberg's eighth film as a director, and was a change from the summer blockbusters for which he had become famous.