Mary Barrows from Clock Tower is the most disturbing character in the game despite.being the only "human" antagonist
Most people who are into the original SNES Clock Tower probably know this by now, but it's worth repeating just in case: It's based on the Dario Argento movie Phenomena. Not officially or anything, but still. Shamelessly and obviously so. Y'all should check it out because it's classic Argento surreal dream horror. The ending is particularly amazing, and was one of the few things not featured in the game. (Don't read this spoiler if you intend to watch the movie because that scene is an amazing surprise.)
Jennifer is saved at the last minute when an enraged chimpanzee attacks the main villainess and stabs her to death to avenge the death of Donald Pleasence.