The available sources do not supply a single canonical origin narrative for nü guǐ. In the comparative and encyclopedic accounts provided, such vengeful ghosts arise when a person suffers a cruel, unnatural, or unjust death or when funeral and burial/cremation ceremonies are omitted or improperly performed; the resulting unrest prevents the dead from attaining a settled post-mortem state and may produce a spirit that returns to seek redress or attention.
The provided sources do not give a consistent, documented physical description specific to nü guǐ. Encyclopedic discussions of 'vengeful ghosts' focus on motive and ritual status rather than standardized visual traits, so specific appearance details are not supported by the supplied material.
Sources characterize vengeful ghosts primarily by behavior: returning from the afterlife to seek revenge for cruel, unnatural, or unjust deaths and arising as 'unhappy' spirits when funerary rites are lacking. Comparative material on spirit possession notes that spirits in many traditions can interact with the living, including through possession, but the supplied texts do not document possession or other particular abilities as specific, universal traits of nü guǐ in Chinese sources.
Weaknesses
- ritualperformance of proper funerary, burial, or cremation ceremonies
Wards
- ritualensure correct funeral and burial/cremation rites

Banshee
A female spirit of Irish and Scottish folklore whose wail heralds an impending death in a family of Gaelic descent. Not a cause of death — a witness to it.

La Llorona
The Weeping Woman of Mexican folklore — the ghost of a mother who drowned her children and now wanders rivers and lakes, weeping for them and taking other children she finds at night.

Rusalka
Water spirits in Slavic folklore — the spirits of young women who died by drowning or suicide, bound to rivers and lakes. Beautiful and dangerous, they can bewitch men to their deaths.

Strigoi
The vampire of Romanian folklore — either a living witch (strigoi viu) or an undead blood-drinker (strigoi mort). The source tradition from which the literary vampire emerged.

Ghoul
A ghoul is a demon-like or monstrous humanoid originating in pre-Islamic Arabian religion, traditionally associated with graveyards and the consumption of human flesh. The concept later entered broader folklore and has been widely reused and transformed in modern fiction and popular culture.
Community Record
- [1]Vengeful ghost. "a vengeful ghost or vengeful spirit is said to be the spirit of a dead person who returns from the afterlife to seek revenge for a cruel, unnatural or unjust death." — Wikipedia: Vengeful ghostwiki
- [2]List of supernatural beings in Chinese folklore. Index of supernatural beings in Chinese folklore (shows taxonomy/context but does not provide detailed nü guǐ rites in the supplied excerpt).wiki
- [3]Spirit possession - Unsolved (HandWiki). "Spirit possession is an altered state of consciousness ... caused by the control of a human body and its functions by spirits, ghosts, demons, angels, or deities." — HandWiki: Spirit possessionwiki
