Immortality is a popular subject in fiction, as it explores humanity's deep-seated fears and comprehension of its own mortality. Immortal beings and species abound in fiction, especially fantasy fiction, and the meaning of "immortal" tends to vary.

Some fictional beings are completely immortal (or very nearly so) in that they are immune to death by injury, disease and age. Sometimes such powerful immortals can only be killed by each other, as is the case with the Q from the Star Trek series. Even if something can't be killed, a common plot device involves putting an immortal being into a slumber or limbo, as is done with Morgoth in J. R. R. Tolkien's The Silmarillion and the Dreaming God of Pathways Into Darkness. Storytellers often make it a point to give weaknesses to even the most indestructible of beings. For instance, Superman is supposed to be invulnerable, yet his enemies were able to exploit his now-infamous weakness: Kryptonite. (See also Achilles' heel.)

Many fictitious species are said to be immortal if they cannot die of old age, even though they can be killed through other means, such as injury. Modern fantasy elves often exhibit this form of immortality. Other creatures, such as vampires and the immortals in the film Highlander, can only die from beheading. The classic and stereotypical vampire is typically slain by one of several very specific means, including a silver bullet (or piercing with other silver weapons), a stake through the heart (perhaps made of consecrated wood), or by exposing them to sunlight.[1][2]

Mythological beings are often used in modern fiction as characters, as a plot device, or even just as "window dressing". Such beings are often either immortal or associated with immortality.

Tezuka Osamu's lifework Phoenix (known in Japan as Hi no Tori) had a phoenix whose blood would provide immortality. In various ages, many "heroes" and "heroines" would strive for immortality only to realize that there is something beyond eternal life. In one story titled "Rose Ham" (lit. "Next World Story") the last remaining human male who survived a holocaust, blessed (or cursed) with immortality through the phoenix blood, would create another beginning of life. In his immortal form, he would see a race of slugs, after gaining intelligence, destroy themselves in another holocaust. He would seed the earth with life that would become present day humans, and finally leave the earth to join his lover, who died billions of years ago, in heaven.

In the Cthulhu Mythos created by H. P. Lovecraft, there is a race of "Fish-Men" known as Deep Ones. They stop aging after reaching adulthood and can breed with humans to birth offspring with this "eternal youth." This is a faustian bargain, as after reaching the age of 20, the Deep One Hybrids undergo a transformation from normal humans into Deep Ones. They also lose all concept of humanity and morality and go to live in the ocean with the Deep Ones and to worship the undersea deity Father Dagon, the Ruler of the Deep Ones and consort to Mother Hydra.

Since immortality is seen as a desire of humanity, themes involving immortality often explore the disadvantages as well as the advantages of such a trait. Sometimes immortality is used as a punishment, or a curse that might be intended to teach a lesson. It is not uncommon to find immortal characters yearning for death.

In some parts of popular culture, immortality is not all that it is made out to be, possibly causing insanity and/or significant emotional pain. Much of the time, these things only happen to mortals who gain immortality. Beings born with immortality (such as deities, demigods and races with "limited immortality") are usually quite adjusted to their long lives, though some may feel sorrow at the passing of mortal friends, but they still continue on. Some immortals may also watch over mortal relations (either related to or descended from them), occasionally offering help when needed.

In legend, most famously in Wagner's opera The Flying Dutchman, a ship's captain is cursed with immortality after attempting to sail around the Cape of Good Hope in a terrible storm. He is doomed to sail around the Cape forever.

In Jonathan Swift's Gulliver's Travels, some of the inhabitants of the island of Immortals (near Japan) don't die, but they age and become ill, demented, and a nuisance to themselves and those surrounding them. Swift presents immortality as a curse rather than a blessing.

In general, a theme seen with many variations, is the notion of an essential world weariness akin to extreme exhaustion for which death is the only relief. This is inescapable when immortality is defined as (half) infinite life. Immortality defined as finite but arbitrarily long per the desire to exist does not, as a definition, suffer this limitation. When a person is tired of life, even death is shut off to them, creating an endless torture.

The undead are fictional people who have died and still maintain some aspects of life. In many examples, the undead are immune to aging or even heal at an accelerated rate. Dracula is one of the most famous examples of the undead.

Immortality can be achieved in fiction through scientifically plausible means. Extraterrestrial life might be immortal or it might be able to give immortality to humans. Immortality is also achieved in many examples by replacing the mortal human body by machines.

There are many examples of immortality in fiction where a character is vulnerable to death and injury in the normal way but possesses an extraordinary capacity for recovery.

The long-running British science-fiction series Doctor Who focuses on a character called the Doctor, a member of the alien Time Lord race, who can "regenerate" instead of dying or aging; however, rather than simply healing wounds, this results in a Time Lord's entire physical appearance changing when fatally wounded or terminally sick. Most Time Lords are only capable of doing so twelve times before finally dying for good, but the Doctor and his friend-turned-foe the Master have each gone beyond this limit, the Master possessing others before the events of the Time War led to him and the Doctor being granted a new cycle of regenerations for helping their people in the conflict.

There are numerous works of fantasy fiction dealing with spiritual immortality in the form of reincarnation or a world of the dead.

The list is in chronological order for the first appearance of the fictitious character.

As noted above, specific characters who as a class tend to be immortal such as vampires and robots are not listed individually. Lists of classes who as a group tend to be possibly immortal include:

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Immortality in fiction - Wikipedia