Yurei, onryo, yokai, ghost, and other creepy things about them: Kayako Saeki, you hear her death rattle, you are dead (Ju On, The Grudge)

Kayako Saeki, The Grudge (2004)

Kayako is the main antagonist of the film Ju-On and its american remake, The Grudge. Her character was created by director Takashi Shimizu.

Kayako is one of the most prolific figures of the japanese horror cinema genre, sharing the first step of the podium with Sadako from the Ring franchise, and also one of the most prominent modern representations of the onryō.

There are two versions of Kayako, the Japanese and the American version.

Kayako, Ju On (Japanese)

Kayako, The Grudge 2 (American)

The only differences between them are that while the Japanese one has got short-to-medium curly hair, her American equivalent share the same haircut as Sadako - long dark falling hair-, these two Kayakos also don't share the same storyline, with minor to crucial changes (some characters she encounters, the way she kills them...).

With those stepped aside, Kayako is portrayed as a crawling young woman with pale - sometimes blue-ish - skin which can be seen bloodstained, wearing a white dress often stained with blood. Her eyes are unbearably wide open, stalking her preys.
Her most recognisable feature is the sound she emits to warn her victims: a creepy death rattle, sign of the cause of her own death by the hands of his husband who broke her neck.
Besides, Kayako possesses supernatural abilities such as breaking the laws of physics - her most frequent way to kill her victims is to drag them somewhere, disapearing entirely from this world - as well as emitting an unbearably oppressing aura capable of killing by fear and disorienting any human.