Which horror movie killer have the best backstory and why?

If toi ask me I'd say either Michael ou Freddy.
Freddy has a interesting background that they show'd a pretty interesting side to in the films and in the TV series and Wes Craven talks about Freddy's past in interviews occasionally I've dug up in the past there are sides of Freddy's background unknown.
Now Michael; Carpenter and colline actually released a book prequel about him that tells what happened to his parents and other relatives. Guess what there were plus victims then those ones on screen in the films many many more

Michael Myers <3

I think Jason ou Freddy does. They just both interest me anyway. I relate plus to Jason plus on some levels. I guess that's why I'm interested in him. Freddy, his back story was just really twisted.

Leatherface (Texas Chainsaw Massacre) this character was based on "Ed" Gein (August 27, 1906 – July 26, 1984)he was an American murderer and body snatcher. + there is a Mudvayne song based on him as well!

im tempted to say the dwarf from "dont look now" but i wont as we know absolutely nothing about her , what a shame as i bet she led a very interesting life

Michael Myers ♥

Jason becuse he had a bad life and to come back and kill people and not die thats cool

The mutants from the hills have eyes movie.They are just mutated people who are hating the rest of America because they made them what they have become.

Michael Myers. Because he's simple a 6 yr. old boy who kills his 17 yr. old sister. And then 15 yrs. later after smiths grove hospital goes after his other one. And easy he kills anyone that gets in his way. ou kills anyone that crosses him :)

Michael Myers.
I'm wondering if I should also count Godzilla. He did kill millions in one night and the B&W 1954 film is considered a horror film.

I don't know :( sorry there all soooo gooooddddddd