While I haven't ever read any official statement from the developers of the game, the Scissorman murderer of the Clock Tower series seems very influenced by the Scissorman character from "Struwwelpeter", a collection of rather morbid cautionary tales for children written by Heinrich Hoffman, a Victorian-era asylum doctor from Frankfurt who wrote and illustrated this collection of stories to educate his three year old son.
To this day the title remains a fascinating read because of its ominous prose, morbid themes and disturbing illustrations, and it has been often linked to cases of child trauma. And in case you were wondering, the Scissorman is in the book the person who punishes naughty little kids that continue to suck their thumbs... with a pair of giant scissors.
"The Door flew open, in he ran.
The Great, Long, Red-Legged Scissorman"