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Summary
Regeneration (also known as healing factor) is a term given when a particular character can heal from wounds at an accelerated rate, even regenerating from wounds that would be lethal to normal humans. Regeneration has different levels.
Low levels of regeneration are essentially just faster natural healing, so a wound that could take weeks to heal would take days, hours, or even seconds. More advanced forms of regeneration can regrow lost limbs, organs, going all the way up to regenerating from decapitation, being blown to pieces or vaporized, and even complete physical destruction.
Types
Low: Faster healing ability for normal wounds.
- Examples: Gale (Sightseeing Psions), Mako Stride with Weakened Kaedna (Heir of Light)
Mid-Low: Able to heal wounds that would normally leave large scars.
- Examples: Aikkon (Dragon Soul), Sakamaki Ryuichi (Fairy Tail Fanon), Linx Rifelson (Gyrohem)
High-Low: Able to regenerate some severed body parts like fingers, arms, legs.
- Examples: Nix Sullivan (Sightseeing Psions)
Low-Mid: Able to regenerate limbs/fatal wounds. Still die from decapitation.
- Examples: Aaron Myers (Exceed), Shirou Emiya with Avalon (From Fake Dreams), Neptune (Starcross)
Mid: Able to regenerate from decapitation.
- Examples: Kirito (A Different Path), Jacque Tremblay
High-Mid: Able to regenerate from being blown into pieces.
- Examples: Samantha Fortepiano (Mirage Saga), Venus (Starcross), Hercules (SIEGE) with Apples of Hesperides
Low-High: Able to regenerate from a puddle/drop of blood, or a small piece of your body.
- Examples: Ensyn Shenlong (Dragon Soul), SOLSTICE with reconstruction (Starcross)
Mid-High: Able to regenerate from being vaporized/turned to dust.
- Examples: Alfonso Felix (Exceed)
High: Able to regenerate from a single molecule/atom/particle.
- Examples: Joseph Dienova Arkend with preparation (Mirage Saga), Relic (Siege)
Low-Godly: Able to regenerate as long as your disembodied consciousness exists/regenerate from other realms.
- Examples: NUMEN, Various Starcross characters (Starcross), Hades (Sacred Heir)
Mid-Godly: Able to regenerate even after every aspect of the mind, body, soul, and consciousness, are erased from existence.
- Examples: Death Eternal (Operation Endgame)
High-Godly: Able to regenerate even if your existence is erased and the reality you are within is destroyed.
- Examples: Tenebris (Kingdom Hearts IV), Chaos Phoenix (The Radiant Savior), Zavin Xcelua (Yuracion Absolon), Xero (Exceedverse)
True Godly: Able to recover after being erased from both existence and nonexistence. Only characters that can regenerate from a beyond-dimensional (Tier 1-A) substance can qualify for this level.
- Examples: Akashi Kasairyu (Yuracion Absolon)
Notes: 1) To qualify for True Godly regeneration, a character must be able to regenerate from being erased from the duality of both existence and nonexistence, whereas it is only necessary to be able to recover from the former in order to warrant a High-Godly rating.
2) 1-A entities (beyond the concepts of dimensions of space and time) always have High-Godly regeneration (given that they are above existence per definition), but not automatically the highest rating. In order to qualify, such beings must also have displayed the capacity to recover from complete outerversal destruction, or be logically capable of doing so.