Ghost Mimicry – The ability to become a ghost and/or mimic ghostly powers. DC seems to have the monopoly as opposed to Marvel on actual ghosts that are major characters.
The Spectre (DC) started out as a ghost character but is now more an avenging spirit (The Spectre V2 #1).
My favorite comic book ghost is Deadman (DC Who’s Who V1 #6).
Deadman has the ability to pass on his powers to a another being and makes Nightwing (DC) into the new Deadman in Injustice – Gods Among Us – Year Three #10.
DC has a supervillain ghost! The Gentleman Ghost (DC) is pictured below (DC Who’s Who V1 #9).
The DC universe also has the very strange Haunted Tank (Haunted Tank #1)!
The Dead Boy Detectives (Vertigo) are the latest DC ghost heroes.
Mr. Justice was one of the first ghost superheroes (Blue Ribbon Comics V1 #9).
John Kowalski (Marvel) is a character that is very similar to DC’s Deadman but is a minor character (Marvel Legacy: The 70’s Handbook #1).
The Ghost Patrol (DC) was a Golden Age ghostly team (DC Who’s Who V1 #9).
DC also seems to have a lot more one shot ghosts than Marvel (World’s Finest V1 #139, Blackhawk V1 #127, Adventure Comics V1 #357, Superman V1 #186, Action Comics V1 #595).
Mort is a teenage ghost that is the protagonist in Mort the Dead Teenager V1 #1 (Marvel).
In Corktown (Alterna), Detective Torrie Brandstaetter is a ghost helping her partner to stop her reanimated body from committing murders (Alterna AnniverSERIES – Character Guide).
Danny Phantom is not a ghost but has ghostly powers.
The Spirit of the Marines is quite literally a spirit in Devil Dog Comics #1 (Street & Smith).
Sergeant Spook is the guardian of a young boy in Blue Bolt V4 #1 (Novelty Press).
Ghostly dogs have a conversation in Reggie and Me #5 (Archie).
Dungeon and Dragons has a huge number of ghosts!
Alley Reaper – Creature Collection I
Banshee – TSR 2140A Monstrous Manual
Bottle-Imp – Creature Collection I
Butcher Spirit – Creature Collection I
Casura – TSR 2158 Monstrous Compendium Annual Volume 2
Chardun – Slain-Creature Collection I
Deathshrieker – D&D 3.5 – Monster Manual III
Dread Wraith – D&D 3.5 – Monster Manual I
Drowned – D&D 3.5 – Monster Manual III
Ekimmu – TSR 2158 Monstrous Compendium Annual Volume 2
Ephemeral Swarm – D&D 3.5 – Monster Manual III
Fey Lingerer – D&D 4th Edition – Monster Manual 2
Forsakken Spirit – Creature Collection III. Savage Bestiary
Ghost Legionnaire – D&D 4th Edition – Monster Manual 2
Ghostfreak – Ben 10
Ghost – World of Warcraft Monster Guide
Haunt – TSR 2140A Monstrous Manual
Ice Haunt – Creature Collection I
Inn-Wight – Creature Collection I
Ker – TSR 2158 Monstrous Compendium Annual Volume 2
Koliahathra – TSR 2158 Monstrous Compendium Annual Volume 2
Love-Scorned Soul – Creature Collection III. Savage Bestiary
Mist Reaper – Creature Collection II. Dark Menagerie
Mistwalker – Creature Collection I
Poltergeist – TSR 2140A Monstrous Manual
Seeker’s Bane – Creature Collection II. Dark Menagerie
Specter – D&D 4th Edition – Monster Manual 1
Spectral Plant – Creature Collection II. Dark Menagerie
Spectral Scion – TSR 2173 Monstrous Compendium Annual Volume 4
Unbegotten – Creature Collection III. Savage Bestiary
Unhallowed – Faithless Knight-Creature Collection I
Unhallowed – False Lover-Creature Collection I
Unhallowed – Forsaken Priest-Creature Collection I
Unhallowed – Treacherous Thief-Creature Collection I
Unholy Child – Creature Collection I
Well Spirit – Creature Collection I
Wraith – D&D 4th Edition – Monster Manual 1
Wraith – TSR 2140A Monstrous Manual
Trading Card Games have a huge number of ghosts and ghost related cards!
All Souls Day
Black Feather Shadow of Rage
Dark Raven Shadow of Grief
Darkness Azaghast Tyrant of Shadows
Dolmarks the Shadow Warrior
Dream Pirate Shadow of Theft
Frost Specter Shadow of Age
Galek the Shadow Warrior
Gazer Eyes Shadow of Secrets
Ghost Being of Ib
Ghost Crew Pirate
Ghost in the Machine
Ghost Knight of Jackal
Ghost Raptor Attack
Ghost Raptor Membership
Ghost Rock Detector
Ghost Rock Fever
Ghost Ship Sighted
Ghostly Seducer Standard
Give up the Ghost
Gray Balloon Shadow of Greed
Grim Soul Shadow of Reversal
Ice Vapor Shadow of Anguish
Jack Viper Shadow of Doom
Masked Horror Shadow of Scorn
Melnia the Aqua Shadow
Mummy Wrap Shadow of Fatigue
Night Master Shadow of Decay
Out of the Shadows
Pointa the Aqua Shadow
Primerunner Ghost Who Walks Samurai
Scream Slicer Shadow of Fear
Shadow Moon Cursed Shade
Souls of the Fallen
Souls of the Forgotten
Spark Chemist Shadow of Whim
Wailing Shadow Belbetphlo
Wisp Howler Shadow of Tears
Zero Nemesis Shadow of Panic
Next Giant Mimicry