Accelerated Development

Accelerated Development
Information
Type	Physical Ability
User(s)	Saitama Garou Glasses Puri-Puri Prisoner Speed-o'-Sound Sonic Pesky Clown
Media
Webcomic Debut	Chapter 11
Manga Debut	Chapter 11
Anime Debut	Episode 3

Accelerated Development is the ability to improve one's strength and skills at an extremely fast rate.

Overview

The user can grow far stronger through fighting and training, improving their natural abilities at a far more rapid pace than most other individuals.

Usage

Saitama

Nearly a year into his training regiment, Saitama noted that as a result of his repetitive routine, his body started adapting to "moving like a hero should", and his power began to explode at a rapid rate. In no time at all, he reached unparalleled levels of strength, speed, and durability through this regiment, a testament to his growth rate. However, according to Genos, Saitama himself cannot explain the secret behind his own strength; the cyborg being certain that he shouldn't have gotten as unbelievably powerful as he currently is by doing such a mundane level of training. Even after reaching an extreme level of power, to the point where nobody was remotely on par with his strength, Saitama continues to grow in power. After experiencing an upsurge of intense emotion, Saitama's rate of growth increase exponentially so that he rapidly outclassed Garou with every subsequent punch, despite Garou's attempts to copy Saitama's level of strength.

Garou

Garou's usage of this ability is also at an incredible degree, as he quickly gets stronger after each battle. His usage of this ability is enhanced even further after his transformation into a half-monster, going from having difficulty against Royal Ripper to effortlessly defeating him. During his fight with Orochi, Garou has shown to become stronger and faster the longer he fights, only being subdued when the Monster King decided to quickly knock him unconscious without giving him the chance to evolve further.

When fighting Superalloy Darkshine, an extremely powerful S-Class hero known for his remarkable strength and overwhelming durability, Garou initially was unable to even leave a mark on him and had difficulty keeping up with his strength. However, as their fight went on, Darkshine noted that not only was Garou becoming more and more powerful every time he was knocked down, but he also seemed to further improve his fighting skills and techniques in the middle of the fight, allowing him to completely overwhelm the hero. Later on, in a more evolved state, Garou has once again demonstrated his advanced growth rate in his battle against Platinum Sperm, going from exchanging numerous blows with him and seemingly only gaining a slight advantage, to being capable of defeating him in a single attack only moments later.

Glasses

Additionally, the B-Class hero, Glasses has demonstrated some degree of a heightened growth rate; although nowhere close to the same level as Saitama or Garou. During his time under the Blizzard Group, Glasses was an unknown and relatively weak B-Class, lacking any notable fighting skills or physical abilities. However, after leaving the group and setting off on his own, Glasses began training extensively; building up enough willpower to restart his entire hero career solo and deciding that he "had no limits". As a result of constantly ripping his entire body apart exercising, his physical strength and speed grew exponentially, allowing him to rise up to B-Class Rank 20 in record time; a feat which the B-Class Rank 2 Hero, Eyelashes, commented was "unbelievable". Despite this improvement however, Glasses noted that he still hadn't caught up to Eyelashes. Eventually, he grew strong enough to stagger and keep up with a weakened and exhausted, but just as formidable Garou; although, once again, Glasses admits that his teammates (A-Class Rank 10, Stinger and B-Class Rank 6, Wild Horn) were more suited to close quarters combat than he was.

Puri-Puri Prisoner

While not at the level of people like Garou, Puri-Puri-Prisoner showcases the capability to grow in strength and overall physical prowess at a rate much faster than normal humans can hope to achieve. While at the start of the series, he was defeated with only slight effort at the hands of the Deep Sea King, a Demon-level (albeit a particularly powerful one) Mysterious Being, since his training, he has grown much stronger than he was before. Most notably, he was able to defeat a monster as strong as the Deep Sea King without much effort, and he also later withstood multiple attacks from Dragon-Level monsters, albeit with heavy damage.

Speed-o'-Sound Sonic

Speed-o'-Sound Sonic has shown a very baffling level of growth throughout the series since his introduction. At the beginning of the series, Sonic claims himself to be faster than the speed of sound, who is confident in his abilities and believes himself to be at the top of the food chain. However, after his embarrassing first loss to Saitama, Sonic has dedicated himself to constantly improving his speed and strength in an attempt to surpass and one day defeat him. After his retreat from the Deep Sea King, Sonic comes back and is shown to be on par with Genos and even outpaces him and gains the upper hand in their bout. Despite this, he is still shown to be no match to Saitama, being defeated by shock waves from his Serious Side Hops. Sonic has also been shown willing to trade his humanity for an opportunity to surpass Saitama, seeing that he was willing to consume a Monster Cell and become a Mysterious Being. He then appears once more to face Flashy Flash following "That Man" awakening from his coma, being now able to fight and pressure Flashy Flash during their duel, and even forced him to use 2 of his Ultimate Techniques. Even then, Sonic was able to get up with minimal damage taken despite taking an onslaught from Flashy Flash.

Expand to see original webcomic information. Beware of spoiler content.

Pesky Clown

The longer he fights against a more capable opponent than himself, the more Pesky Clown adjusts and evolves in order to match them. Sweet Mask calls such a monster a "Rapid Growing" type.

Gallery

Glasses blocks Eyelashes' kick with little effort, much to his shock

Glasses manages to keep up with a weakened Garou in combat, evading his strike at the last second

Garou easily defeating Royal Ripper in their rematch despite having difficulties dealing with the monster before

Garou's movements getting faster as he attacks Superalloy Darkshine

Saitama overpowers Garou with his exponential growth

List of Known Users

Name	Affiliation	Status
Saitama	Hero Association (Saitama Group)	Alive
Garou	Unaffiliated	Alive
Glasses	Hero Association	Alive
Puri-Puri Prisoner	Hero Association	Alive

The following section contains webcomic spoilers.
Pesky Clown	Unaffiliated	Deceased †