User with this ability either is or can transform into an undead, corporeal beings in mythology, legend or fiction that are deceased yet behave as if alive. A common example is a corpse re-animated by supernatural forces, by the application of the deceased's own life force or that of another being (such as a demon).
Users with this power lack physical weaknesses, such as pain, need to rest, vulnerability to environmental effects, etc, while some still need to consume various substances (blood, flesh, life-force). Being clinically dead, their brains and bodies are immune to most powers that affect living beings.
Exodia Necross (Yu-Gi-Oh!) is the undead form of Exodia.
Silver Fullbuster (Fairy Tail) was a zombie revived by the Demon Keith.
Marvel Zombies (Marvel Zombies)
Captain America (Marvel Zombies)
Hulk (Marvel Zombies)
Iron Man (Marvel Zombies)
Spider-Man (Marvel Zombies)
Thor (Marvel Zombies)
Wolverine (Marvel Zombies)
Miss Marvel (Marvel Zombies)
Venom (Marvel Zombies)
Wasp (Marvel Zombies)
Morbius (Marvel Zombies) is half-vampire half-zombie.
Lockjaw (Marvel Zombies)
Avengers of the Undead (Marvel Comics)
Brigade (Marvel Comics)
Having eaten the Yomi Yomi no Mi, Brook (One Piece) was able to return to life, though his soul was unable to find his way back to his body before it had been reduced to a skeleton.
A zombie (Resident Evil) produced by the T-virus.
Stubbs (Stubbs the Zombie) has many undead traits, hence his name.
Jason Voorhees (Friday the 13th)
Cerberus (One Piece)
Death's dog (Family Guy)
Dry Bowser (Super Mario)
Fu Chi'en (Tenjho Tenge) has been converted into a zombie after being killed.
Lich (Final Fantasy 1)
After being flayed alive by Willow Rosenberg, Warren Mears (Buffy the Vampire Slayer) continued to live in a skinless undead state thanks to the intervention of Amy Madison.
Judge Death (2000 AD)
Death Judges (2000 AD)
Zombie Wario (Wario)
Sir Daniel Fortesque (MediEvil)
Skylanders of the Undead Element
The Drowning Doom (Brütal Legend) are a group of humans who, through drinking from the Sea of Black Tears, have become a race of undead beings gifted with great power in exchange for their will to live.
The Shredder (Teenage Mutant Ninja Turtles 2012) has been resurrected as an undead monster by Kavaxas.
The Six Paths of Pain (Naruto) were dead corpses of Ninjas that Nagato reanimated to serve as his vessels.
Aikawa Ayumu (Kore Wa Zombie Desu Ka) is reanimated by Euclidwood Hellscytje as a zombie.
The Stitched (The Stitched)
Church (Pet Sematary) was a cat that was reanimated into an undead terror after he was buried in the Micmac Burlal Ground.