Immortality

Lord Voldemort — Cannot die while his horcruxes exist, converting his immortality into a findable inventory of objects

Ra's al Ghul — Renews his life in the Lazarus Pit, paying each time with a period of violent insanity

Vandal Savage — Immortal since prehistory through meteor radiation; dangerous for accumulated knowledge rather than invulnerability

Apocalypse — Kept alive across millennia by Celestial technology rather than by his own mutation

The Spectre — Persists as a bound force rather than a body, tied to a host and a mandate

Hawkman — Dies and reincarnates repeatedly across history rather than avoiding death

Wonder Woman — Ages far slower than a human and is written as effectively ageless

Wonder Woman — Survives injuries that would be fatal to a human without lasting harm

Hulk — Returns from death repeatedly, which the series makes its central premise

Hulk — Cannot be permanently killed by conventional means

Thanos — Cannot age or die by ordinary means, a gift he treats as a curse

Thanos — Survives being unmade and returns, which the stories treat as routine

Darkseid — A New God — ageless, and repeatedly returning after apparent death

Darkseid — The Anti-Life Equation is his goal precisely because force alone will not finish it

Majin Buu — Regeneration is stated to make conventional killing impossible

Silver Surfer — Does not age, eat or breathe, sustained entirely by cosmic energy

Apocalypse — Millennia old, sustained by Celestial technology rather than by mutation alone

Apocalypse — Transfers his consciousness into new bodies to survive death

Apocalypse — His survival doctrine is the character's thesis, not a power description

Lobo — Barred from both heaven and hell, which is written as why he cannot stay dead

Lobo — Wounds that would kill any Czarnian close within moments

Plastic Man — Survives being shattered into fragments and reassembles

Plastic Man — Spends centuries as scattered pieces on the ocean floor and recovers fully

Plastic Man — Written as effectively unkillable, which the League treats as a tactical asset

Hawkman — Reincarnates repeatedly across eras, which is the character's defining premise

Hawkman — Recalls skills from previous lives, which is why he fights like an ancient soldier

Mystique — Ages far slower than a human, which is how she predates most of the X-Men

Mystique — Longevity is a consequence of the shapeshifting, not a separate mutation

Envy — Survives destruction as long as the Philosopher's Stone souls inside remain

Envy — Dies only once the stone is exhausted, not from any wound

The Spectre — A spirit rather than a body, and cannot be killed by physical means

The Spectre — Persists across eras and hosts without diminishing

DIO — A vampire who does not age and recovers from destruction of most of his body

DIO — Sunlight is the stated weakness, not injury — which is how he is finally killed

Swamp Thing — Regrows a whole body from any plant matter on Earth after his is destroyed

Swamp Thing — He is not a man turned into a plant but a plant that believes it was a man — the reveal that redefined the character

Silver Banshee — Cursed rather than powered — she is undead and does not age

Silver Banshee — Returns after apparent destruction, since the curse rather than the body carries her

Floronic Man — A plant elemental who does not age and reforms after destruction

Floronic Man — Severing him from the Green is what stops him, not injury

Vandal Savage — Immortal since prehistory after exposure to a meteorite

Vandal Savage — Claims to have been numerous historical figures, a claim the stories neither confirm nor deny

Vandal Savage — His advantage is accumulated knowledge rather than any combat power

Muzan Kibutsuji — Has lived over a thousand years and does not age

Muzan Kibutsuji — Sunlight is his only true weakness, which is the whole plot's constraint

Muzan Kibutsuji — His entire thousand-year search is for a cure to sunlight, not for power

Ryuk — A shinigami who cannot die by human means and does not age

Ryuk — Shinigami die only by extending a human's life, the one stated rule

Ryuk — Sees the name and lifespan of any human on sight — a shinigami trait, not a notebook power

Denji — Dies and returns as a devil-human hybrid, which is the series' opening event

Denji — The Chainsaw Devil erases any devil it kills from human memory entirely

Makima — Damage directed at her is transferred to ordinary people instead

Makima — Survives repeated apparent deaths because the harm never reaches her

Frieza — Survives being cut in half and exposed to space

Frieza — Does not need to breathe, stated explicitly as why space does not kill him

Frieza — He never trained before the Golden form, which is stated as his one real limit

Ryomen Sukuna — Could not be killed, so he was split into twenty fingers and sealed instead

Ryomen Sukuna — The fingers remain potent for a thousand years without decaying

Yusuke Urameshi — Dies in the first chapter and is returned to life for the job

Yusuke Urameshi — Dies a second time and returns as a demon, which changes the power source

Galactus — Predates the current universe, having survived the previous one

Galactus — Cosmic entities treat him as a necessary balance rather than a criminal

Black Adam — Thousands of years old, having held the power since antiquity

Black Adam — Rules Kahndaq as head of state, so his conflicts are geopolitical

Ghost Rider — The spirit of vengeance cannot be permanently destroyed by physical means

Ghost Rider — The Stare fails on anyone without guilt, the stated limit

Ghost Rider — Returns after the host body is killed, taking a new one

Blade — Ages far slower than a human, a dhampir trait

Blade — Sunlight, garlic and silver do not affect him, which is the whole advantage

Blade — Later gains a thirst for blood, which he manages with a serum

Brainiac — A Coluan intelligence that persists across bodies and centuries

Brainiac — Transfers his consciousness into a new body when one is destroyed

Brainiac — Operates through drones so the body destroyed is rarely the real one

John Constantine — Cons three separate demon lords into keeping him alive to avoid ceding his soul

John Constantine — Survives lung cancer by the demon gambit — a con rather than a cure

John Constantine — Manipulates Swamp Thing into acts he would not otherwise commit

Tsunade — Maintains a youthful appearance by continuous transformation jutsu

Tsunade — The seal's release ages her, which is the stated cost of the healing

Orochimaru — Transfers his consciousness into a new host body every few years

Orochimaru — His goal is learning every jutsu, which requires unlimited time — the motive behind the immortality

Orochimaru — Survives inside Kabuto after his own body is sealed

Sailor Moon — Reincarnated from Princess Serenity of the destroyed Moon Kingdom

Sailor Moon — Returns after death more than once, tied to the crystal