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).
Killgrave armed his henchmen with a nerve gas similar to his own pheromones, but Daredevil was still able to resist the effect. Trying a new ploy, the Purple Man commanded the local citizenry to attack him. Enlisting the aid of Ivan Petrovich, an ally of the Black Widow, Daredevil managed to escape.