User blog comment:Metal Mario875/Q&A, anyone?/@comment-27255656-20161203185225/@comment-27255656-20161203191408

Freddy and Michael actually have other connections. They killed someone related to them (Freddy killing his wife, Michael killing his older sister), possess immortality and are pure evil, as well as being dreaded/feared killers of a certain town, Springwood, Ohio for Freddy, Haddonfield, Illinois for Michael. I apologize for not mentioning them to you sooner.