Immortality

Introduction
Immortality is the term given to people who cannot die from natural means, whether this be due to longevity, regeneration, or other means.

Types
1: Longevity: Characters gifted with this type of immortality cannot die from natural causes, such as old age or conventional illness, but can be killed by unnatural causes. 2: Immortality without regeneration: Characters with this degree of immortality can survive a high degree of physical damage, though they cannot regenerate from it either. 3: Immortality via regeneration: Characters with this type of immortality can simply regenerate damage, though the usefulness of this type depends on the degree of regeneration. 4: Immortality via godhood, or protection from a deity: A character that was either granted immortality by a god, or is immortal because of its hierarchical position due to godhood, so that its divine immortality is less a power, and more treated as a consequence of its state of being as a deity. 5: Perfect Immortality: ''Complete and utter inability to ever die. This is typically reserved for questionable omnipotents.'' 6: Parasitic: The person attains a sort of immortality by bodyhopping, transferring their soul to another body. 7: Undead: ''Self explanatory. The undead generally double up with other types of immortality, often being impossible to kill through conventional means.'' 8: Reliant Immortality: The power to be immortal so long as a certain object, person, concept etc. exists. 9: Transcendental Immortality: ''Characters whose true selves exist independently from the plane where they can be killed. For example, a conceptual being doesn't die even if its body, soul, etc will be erased from existence.'' 10: Meta-Immortality: ''Entities that are not alive or dead in a conventional sense, standing outside the ordinary laws of reality, temporality, and dimensionality (of any number). If it is possible to destroy such a character, it can only be accomplished by a being of a similar or higher existence.''
 * Examples: Galactus (Marvel Comics), Ajimu Najimi (Medaka Box)
 * Examples: Voldemort (Harry Potter), Hidan (Naruto)
 * Examples: Alucard (Hellsing), Majin Buu (Dragon Ball), Hourai Immortals (Touhou Project)
 * Examples: Future Zamasu (Dragon Ball), Zeref Dragneel (Fairy Tail), Juggernaut (Marvel Comics)
 * Examples: Azathoth (Cthulhu Mythos), Kami Tenchi (Tenchi Muyo!), The Creator (Umineko no Naku Koro ni)
 * Examples: Teridax (Bionicle), Jason Voorhees (Friday the 13th), Orochimaru (Naruto), Darth Sidious (Star Wars Legends)
 * Examples: Jason Voorhees (Friday the 13th), Edo Tensei zombies (Naruto)
 * Examples: Voldemort - reliant on Horcruxes (Harry Potter), Fairies - reliant on aspects of nature (Touhou Project), AIM Burst - reliant on the Level Upper Network (To Aru Majutsu No Index), Chara - reliant on the concept it embodies (Undertale)
 * Examples: Tokiha Misa and other characters from Notch, Bard, SCP-682
 * Examples: All 1-A characters