Chuckie
https://en.wikipedia.org/wiki/Child%27s_Play_(1988_film)
http://www.the13thfloor.tv/2016/03/18/did-you-know-the-movie-childs-play-is-based-on-a-real-event/

Sauron
http://mural.uv.es/igpasmon/TolkwarC.htm

Dr Jekyll and Mr Hyde
http://docuwiki.net/index.php?title=Jekyll_and_Hyde_-_The_True_Story
http://www.bbc.co.uk/news/uk-scotland-31018496

The Hound of the Baskervilles
https://en.wikipedia.org/wiki/Richard_Cabell
http://knowledgenuts.com/2014/06/10/the-creepy-inspiration-for-hound-of-the-baskervilles/

Frankenstein
https://www.huffingtonpost.com/roseanne-montillo/the-gruesome-true-inspira_b_2622633.html
http://time.com/3648440/mary-shelley-frankenstein-history/
https://en.wikipedia.org/wiki/Johann_Conrad_Dippel

Dorian Gray
https://en.wikipedia.org/wiki/John_Gray_(poet)
https://strangeflowers.wordpress.com/2009/11/17/the-real-dorian-gray/
https://en.wikipedia.org/wiki/Decadent_movement
https://en.wikipedia.org/wiki/The_Picture_of_Dorian_Gray

The Headless Horseman
http://www.icysedgwick.com/headless-horseman/
https://www.bustle.com/articles/41773-is-sleepy-hollow-based-on-a-real-headless-horseman-legend-it-depends-on-how-superstitious-you
http://www.kitgentry.com/sleepyhollow_real05.html

The Werewolf
https://www.wired.com/2014/07/fantastically-wrong-fiendish-werewolf/
https://en.wikipedia.org/wiki/Werewolf
https://www.historicmysteries.com/history-of-the-werewolf-legend/
The Boogeyman
https://en.wikipedia.org/wiki/Bogeyman
https://en.wikipedia.org/wiki/Albert_Fish

Dracula
http://romaniatourism.com/dracula-legend.html
https://en.wikipedia.org/wiki/Dracula
https://www.history.com/news/ask-history/was-dracula-a-real-person