Regeneration, often referred to as a healing factor, is the ability to heal from wounds at an accelerated rate, with many characters proving capable of regenerating from wounds that would be lethal to normal humans.
It has several different levels that range in potency from what is essentially just faster natural healing to being able to regrow limbs or organs, or even a severed head.
Higher levels allow characters to regenerate from even more severe wounds, such as being blown to pieces, reduced to a single cell, vaporization, and even complete physical destruction and beyond.
Instances of characters being wounded and inexplicably recovering off screen should not be taken as evidence of regeneration unless supported by further context. This is due to reasons ranging from possibility of off-screen treatment to continuity errors. See this thread for reference.
Low: Merely an accelerated healing ability for normal wounds, allowing the character to heal wounds that would normally take days, weeks, or even months much more quickly, sometimes even in just seconds. For machines and vehicles, this would just be regenerating basic exterior damage.
Mid-Low: The ability to heal wounds that would normally leave large scars, such as severe burns or deep injuries. For machines and vehicles, this would be regenerating damage that would normally leave large dents and openings.
High-Low: The ability to regenerate severed fingers, toes, or ears, minor organ damage, and even potentially reattach lost limbs. For machines and vehicles, this would be regenerating some interior damage, along with some minor critically damaged or destroyed parts.
Low-Mid: The ability to regenerate lost limbs, limited brain damage, and even severe organ damage or destruction, including traditionally fatal wounds and disembowelment or horizontal bisection. For machines and vehicles, this would be regenerating minor parts and more extensive internal damage.
Mid: The ability to regenerate from decapitation or severe brain damage. For machines and vehicles, this would be regenerating from the destruction of critical parts, such as the engine.
High-Mid: The ability to regenerate from being blown/cut to pieces, brain included, or from a small piece of the user's body, such as a finger, or the heart.
- Examples: Meta-Cooler (Dragon Ball), Dio Brando (JoJo's Bizarre Adventure), Ryūko Matoi (Kill la Kill)
Low-High: The ability to regenerate from having no solid parts of the body remaining. This can range from a puddle or drop of blood to even a single cell. For robots and machines, this can also include regenerating from a liquid state.
Mid-High: The ability to regenerate from having all biology completely incinerated. This includes being reduced to ash, dust, smoke, vapor, or plasma.
- Examples: Majin Buu (Dragon Ball), Dark Matter (Kirby), Deadpool and Hulk (Marvel Comics), Ban (Nanatsu no Taizai), Logia Devil Fruit users such as Portgas D. Ace (One Piece)
High: The ability to regenerate from a few scattered or lone molecules, atoms, or sub-atomic particles.
Low-Godly: The ability to regenerate from the complete physical destruction of the user's body, instead restoring it from their disembodied consciousness, whether that be their soul, mind, some other nonphysical aspect of themself, esoteric or metaphysical energy, or something else.
- Examples: Dark Schneider (Bastard!!), Sosuke Aizen (Bleach), UlforceVeedramon (Digimon), Spawn (Image Comics)
Mid-Godly: The ability to regenerate from the complete erasure of body, mind, and soul.
- Examples: Gods from Saint Seiya, Indramon (Digimon), Kaguya Houraisan and Fujiwara no Mokou (Touhou Project)
High-Godly: The ability to regenerate after the erasure of body, mind, and soul, along with at least one even more fundamental aspect of a character's existence, such as their place in the narrative, their entire history, or the underlying information (Type 2) or concept(s) (Type 1 or 2, but only very rarely 3, if there is strong evidence of being similar to the former types in terms of how hard it is to regenerate from them) needed for them to exist.
- Examples: Demons from Shin Megami Tensei, Kriemhild Gretchen (Puella Magi Madoka Magica), Yggdrasil (Digimon), Lavos (Chrono), Sailor Moon
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