[[quoteright:350:[[Film/{{Ghost 1990}} http://static.tvtropes.org/pmwiki/pub/images/ghost_movie_musical.jpg]]]]
[[caption-width-right:350:Easy come, easy ghost.]]

->''"What is a ghost? A tragedy doomed to repeat itself?"''
-->-- ''Film/TheDevilsBackbone''

Ghosts are usually people who have died, but their [[OurSpiritsAreDifferent spirits]] are still lingering around. [[FriendlyGhost Some are friendly]], some are neutral, and some are vengeful. It all depends on what kind of story is being told.

'''[[GhostlyGoals Reasons include:]]'''

# [[{{Revenge}} Avenge me]]! The ghost was killed through foul play, knows it, and wants the murder avenged. Sometimes, this also comes with a ClearMyName sidebar. This one can also lead to ghosts becoming violent and angry if not avenged. They may explicitly say that they cannot rest easy in the graves until they are avenged.
# UnfinishedBusiness: Something that was significant or important to the person they used to be when alive remains undone. The ghost hangs around until this is done, and may or may not [[UndeathAlwaysEnds move on afterward]].
# The ghost hasn't yet figured out they're dead, or are so attached to what they did in life they are still doing it out of habit and/or affection. This can lead to a TomatoInTheMirror shock or a SpiritAdvisor.
# They're aware they're dead and angry at living people because they are still alive.
# That's just how the Afterlife works in this universe. No alternate dimension, Higher Plane of Existence or anything -- you just become a ghost when you die.
# The ghost suffered so in life that the spirit was drawn to the place where the worst torment took place.
# [[LivingMemory Resounding psychic echo]]. The ghost [[OurSoulsAreDifferent isn't even the person's soul]], but just a spectral imprint left behind by the person's death that's gained a form of sentience. In paranormal fields, these are usually called residual hauntings.
# ThePowerOfLove. They feel someone they love can't make it without them, or needs protection.
# No funeral, no grave -- [[DueToTheDead they cannot rest without proper memorialization]] -- or perhaps their graves have been moved or desecrated.
# Or maybe someone is mourning them ''too'' much, and as a consequence, they are bound to this world.
# The person who arranged for their burial was a beneficent stranger, and they must make return for this good deed. This type is the original "grateful dead".
# They were very, very naughty in life and fear crossing over to the Afterlife and facing possible cosmic retribution.
# They were very, very naughty in life and ghosthood ''[[CoolAndUnusualPunishment is]]'' their cosmic retribution. If it's of a purgatorial type, sometimes humans can help out.
# They're a spirit form of some sorcerer, and actively made preparations to ensure themselves [[ImmortalitySeeker eternal life]] after their bodies gave up, or just ended up that way because of their power.
# [[BarredFromTheAfterlife They were magically prevented from going to]], or were magically drawn back from, the Afterlife.
# The boundaries between the realms of the living and dead have been weakened; this tends to bring about ''lots'' of ghosts. This can be a regular, normally annual, occurrence, in which case you just want to propitiate them, or indicate serious problems as a one-time thing.
# They can move on any time they want; they just don't want to because they're having too much fun.
# There's also the odd rare case of a ghost that was never a living human being. It may have spawned from something. It may be part of a broader species. It may be an animal. It may be a synthetic ghost made by alchemy. It may just be some odd spooky apparition. In cartoon setting, a ghost child can be considered to be the son of a couple of "normal" ghosts, born after the two normal ghosts's death (this is mainly to have a young ghost spectators can identify to, without addressing the issue of a child's death). Or it may be some sort of... ''[[EldritchAbomination thing]]'' pretending to be a ghost to suit its purposes.

'''Powers include:'''
* {{Intangibility}} or Phasing: Default state of ghosts tends to be intangible. They can, with an effort of will, become tangible, but they usually cannot pass on that intangibility to anything they were holding. Typically, if they pass through solid matter while holding something, the solid matter remains behind after the ghost has passed through. This is most common in modern works; older ones are more likely to be (inexplicably) solid, and some can even pass for living humans.
* {{Invisibility}}: Some ghosts can choose whether they want to be visible to anybody. Others are visible only to a gifted few.
* [[BlowYouAway Wind]] powers are a common ghostly ability.
** Sometimes they have [[PlayingWithFire fire]] / WillOTheWisp powers too.
** Or equipment the ghost used in life becomes an [[JacobMarleyApparel ectoplasmic version of same]] that can hurt other ghosts.
* PsychicPowers: Usually [[MindOverMatter telekinesis]] for moving and throwing things around in a ghost tantrum/poltergeist fit.
** Other times, they can project [[ScreamerTrailer Scary Visions]] into the mind of a victim.
* VoluntaryShapeshifting: Ghosts can sometimes morph into morbidly, gruesomely horrific, grotesque (or amusing) shapes to terrify their haunts.
* Materializing: Ghosts can usually create a body/illusion of themselves as they were when alive. However posing as a human will usually result in [[GlamourFailure slight flaws]] in their facade, like lacking a pulse or cold skin.
* DemonicPossession: Some ghosts can take over the body of a living person and operate it like a puppet. For some ghosts, this is the next best thing to being alive again. For others, it's simply an expedient because they can't experience what their host is experiencing.
* DreamWalker: Some ghosts can inject themselves into a living person's dreams. Usually this person is someone psi-gifted, though.
* {{Flight}}/[[PowerFloats Levitation]]: [[MindOverMatter not]] necessarily limited to the ghost itself.
* WeatherManipulation: Some ghosts can create rain, thunder, lightning, high winds, even sleet or snow. In ''Film/TheGhostAndMrsMuir'', Mrs. Muir reveals that the Ghost can never fool her about his emotional state because the weather barometer always reveals his genuine mood.

'''Limitations Include:'''
* Some ghosts are only able to show up between sundown and sunrise.
** Others can only appear on certain days(nights); for single ghosts, this is often a significant date in their lives, but in masses, there is often a LiminalTime where ghosts walk because the boundaries between life and death are thin (which may also be year's end, or otherwise a boundary between times).
* Some ghosts are unable to enter churches.
* Most ghosts are [[ClosedCircle restricted to haunting a specific house]] or [[HauntedFetter object]]. If you can leave the premises you're usually safe. Destroying said house or object will usually remove the ghosts' anchor to the material world and force it to move on, but it might just allow it to haunt anywhere it wants to.

'''Interaction With The Living'''
* Avenge Me! Ghosts can often appear to their closest friends or family. Like, you know, Theatre/{{Hamlet}}.
* Attention-seeking. A lot of paranormal investigators who subscribe to the view that ghosts are spirits believe that this is the major reason for most hauntings.
* [[PsychicPowers Mediums]] can [[ISeeDeadPeople see and/or hear ghosts]].
* {{Magitek}} - Ghosts can become a literal ghost in the machine, and operate phones, computers, etc. without actual tangible hands. (See psychic powers above)
* Artifacts - there are magical gewgaws and doodads, HolyRelic items and that sort of thing lying around TheVerse that will allow one to contact ghosts. Or are ''[[ArtifactOfDoom possessed]]'' by ghosts.
* [[CoveredInGunge Ectoplasm]] - "He slimed me. I feel so funky."
* Containment - Some heroes have enough MadScientist mojo to have come up with a way to contain ghosts, or protect themselves and others.
* ElectromagneticGhosts - Interferes with electronics with just their presence.
* GhostlyChill - Their vicinity or interaction cause the temperature to drop off visibly.
* Haunting - They will torment the living, annoy, or bedevil the living, or seek to drive the living into confessing if they've done wrong.
* {{Angst}} and {{Wangst}} are often involved with ghostly hauntings, particularly when love is involved.
* Often (particularly in media intended for children) [[GhostlyAdvisor only a select few can see/hear them]].
* Popping in and disappearing just as fast, leaving those who saw them claiming ItWasHereISwear.
* SpiritAdvisor or FairyGodmother -- who can often conceal being a ghost until TheReveal at the end. Usually when the ghost has a {{Protectorate}}, such as a child, or the person who arranged for burial.

'''Possible Appearance:'''
* As they looked when they were alive, possibly being either a CuteGhostGirl or [[CuteGhostGirl Guy]].
* JacobMarleyApparel: As they wear the clothes they died in.
* BedsheetGhost: Covered in a white shroud. This white sheet may be the only part of them that's visible.
* StringyHairedGhostGirl: A Japanese variant. Wears a kimono with long stringy black hair covering her face.
* HitodamaLight: Another Japanese variant, where a coloured flame (usually purple) is attached to the ghost or showing a person possessed by a ghost. People wearing candles on their head are invoking this appearance.
* As they look now - rotted, filthy, partially skeletal and covered in worms or maggots, wearing the clothes they were buried in.
* FogFeet: Most ghosts have these genie-like tails instead of having two legs.
* Any of the above can also be combined with transparency or the ability to become invisible.
* [[BeautyEqualsGoodness Good ghosts may be even more beautiful than they were in life, either as a reflection of their true self or as a reward]].
* Multiple forms: Changing appearance depending on their mood, e.g. looking almost alive while minding their own business and rotted-looking when attacking someone. The ghost equivalent of GameFace.

Some good ghosts get to AscendToAHigherPlaneOfExistence (either literally [[FluffyCloudHeaven heaven]], or something else) once they've [[ButNowIMustGo sorted out]] their issues or unfinished business. Bad ones can get the express elevator [[{{Hell}} down]]. Some of them have problems with GhostAmnesia. Every ghost has different GhostlyGoals, again depending on what they want.

Shows and movies will usually address these baseline rules, whether or not they're enforced.

See also OurSoulsAreDifferent. Compare LivingMemory. Despite the name, TheGhost is not usually an example.

Stock traits:
* BackFromTheDead
* DeadToBeginWith
* DisappearsIntoLight
* FogFeet
* GhostAmnesia
** DeadAllAlong
* GhostlyGoals
** UnfinishedBusiness
* JacobMarleyApparel
** ChainedByFashion
* PerpetualMotionMonster

Types of ghost:
* AnAstralProjectionNotAGhost
* BedsheetGhost
* CuteGhostGirl
* GhostLights
* GhostPirate
* GhostShip
* HellHound
* HellishHorse
* {{Poltergeist}}
* StringyHairedGhostGirl
* SpiritAdvisor
* UndeadChild
* WillOTheWisp
* WomanInWhite

Interactions with the living:
* ElectromagneticGhosts
* GhostlyChill
* ISeeDeadPeople
* DeadPersonConversation
* YouLookLikeYouveSeenAGhost
* WhoYouGonnaCall

Haunted places:
* BigBoosHaunt
* GhostPlanet
* GhostTown
* GhostCity
* HauntedCastle
* HauntedHeadquarters
* HauntedHouse
* IndianBurialGround