An extremely formidable mercenary and powerful swordsman, Guts (Berserk) was already a veteran of numerous battlefields since the age of 9.
Tōshirō Hitsugaya (Bleach) was able to graduate from the Shinigami Academy in a single year with the highest written and performance scores in each of his classes and the youngest Soul Reaper to ever reach the rank of captain.
Ichigo Kurosaki (Bleach) became a Shingami at age 15, while still an inexperienced teenager his astounding growth rate allows him to become one of the strongest Shinigami, surpassing even most Shinigami Captains.
after two years, at 17 Ichigo awaken his true power as a transcendent Shinigami proving the Wandenreich's expectations that Ichigo could surpassed even Genryusai as the strongest Shinigami of all time.
Kenpachi Zaraki's (Bleach) potential as one of the strongest Shinigami was prominent in his boyhood, allowing him to kill hundreds of outlaws...
...and defeating captain Retsu Unohana, the supreme master swordswoman, who believed Kenpachi potential was stronger than herself.
Despite being a high-school student, Prince Akatsuki (Choujin Koukousei-tachi wa Isekai demo Yoyuu de Ikinuku you desu!) is the greatest magician in the world.
Despite being a high-school student, Ichijou Aoi (Choujin Koukousei-tachi wa Isekai demo Yoyuu de Ikinuku you desu!) is the strongest martial art master in the world.
While still a high-school student, Kanzaki Keine (Choujin Koukousei-tachi wa Isekai demo Yoyuu de Ikinuku you desu!) is the finest doctor in the world.
While still a high-school student, Sanada Masato (Choujin Koukousei-tachi wa Isekai demo Yoyuu de Ikinuku you desu!) is the most successful entrepreneur in the world.
While still a high-school student, Ooboshi Ringo (Choujin Koukousei-tachi wa Isekai demo Yoyuu de Ikinuku you desu!) is the most brilliant scientific genius the world has ever known.
Sarutobi Shinobu (Choujin Koukousei-tachi wa Isekai demo Yoyuu de Ikinuku you desu!) a highschool student who is also the world's best journalist.
While still a high-school student, Mikogami Tsukasa (Choujin Koukousei-tachi wa Isekai demo Yoyuu de Ikinuku you desu!) is a genius politician who served as the Prime Minister.
Layfon W. Alseif (Chrome Shelled Regios) is a natural-born prodigy among even the Twelve Heavens Blade, being capable of becoming one at the age of ten. It was stated by even his master Lintence that he could break-down and master Kei Techniques after just seeing them performed once.
Due to reincarnating and training since birth, Vandalieu (The Death Mage Who Doesn't Want a Fourth Time) became strong enough to kill Pure-breed vampires at age 8 and Evil Gods at age 9.
Tokitou Muichirou (Demon Slayer: Kimetsu no Yaiba)
Vegeta (Dragon Ball series) showed tremendous power from a young age, even by the standards of First-Class warriors and the royal bloodline of the Saiyan race, breaking all previous records of Saiyan attributes.
Broly (Dragon Ball Super) was born with an unbelievable power level, even among Saiyans, which was just a prelude to his true potential
Frieza (Dragon Ball series) is a natural prodigy, having been born so powerful that he never had to train a day in his life...
...and when he did decide to train, he gained power comparable to gods within four months.
Trunks and Son Goten (Dragon Ball Z)
Rebecca (Dragonar Academy) is the second youngest Breeder to become a Dragonar.
Edward Elric (Fullmetal Alchemist), an alchemical prodigy, became a State Alchemist at age 12.
Gin (Ginga: Nagareboshi Gin)
Often called the "Bastard Child of the Death God", Mukuro, later known as Nobume Imai, (Gintama) is a masterful assassin even as a child her skills earned her the position as one of the Three Wings of Naraku.
Shinpachi Shimura (Gintama)
Since childhood, Suzaku Himejima (Highschool DxD) has outstanding talent in the spiritual arts of Shinto Mysticism, having been chosen to be the guardian of the Vermilion Bird at the age of 15.
Genbu Doumon (Highschool DxD) became the guardian of the Black Tortoise, at a much younger age than Suzaku and Seiryu due to her spiritual talents.
Hida Nayuta (Hybrid × Heart Magias Academy Ataraxia) talent and genius were noticeable since she was a child, and eventually became a god on her own.
Yurishia Farandole (Hybrid × Heart Magias Academy Ataraxia) is among the best fighters of the world, despite being around 17. She's been hailed as the "World Strongest" by many.
Hida Reiri (Hybrid × Heart Magias Academy Ataraxia) has always excelled in everything she did since she was young, She would become the commander of Ataraxia while in her early 20's.
Tatenashi Sarashiki (Infinite Stratos) is a young prodigy, being exceptionally skilled at almost everything she does and is openly regarded as the strongest student at IS Academy, which is full of talented young girls.
DIO Brando (JoJo's Bizarre Adventure)
Being a natural born Ripple/Hamon user through his grandfather's bloodline, Caesar A. Zeppeli (JoJo's Bizarre Adventure Part II Battle Tendency) could unconsciously project its power from an early age.
During his childhood, Joseph Joestar (JoJo's Bizarre Adventure Part II Battle Tendency) developed and displayed his ability to use the Ripple/Hamon he inherited from his grandfather and mother.
Possessing one of the world's strongest Stand, Jotaro Kujo (JoJo's Bizarre Adventure Part III Stardust Crusaders) wields Star Platinum with the aptitude of a master at the young age of 17.
An evil baby genius, Mannish Boy (JoJo's Bizarre Adventure Part III Stardust Crusaders) is a deadly Stand user of the nightmare wielding, Death 13.
Bruno Bucciarati (JoJo's Bizarre Adventure Part V/5: Golden Wind/Vento Aureo)
Born with an IQ of 152, Pannacotta Fugo (JoJo's Bizarre Adventure Part V/5: Golden Wind/Vento Aureo) was considered by many to be a child prodigy, having entered a university to study law at the age of 13.
Often described as a child of the war gods, Kyou (Kingdom) was a prodigy in both warfare and strategy from an early age and was considered the deadliest member of the Six Great Generals of Qin despite the being youngest.
Due to him being sent to brutal battlefields from a very young age and mowing down countless masses of enemies, Earl Shi of the Wei Fire Dragons (Kingdom) at age 15 had already killed over 500 opponents.
Becaming the king of the Chouga tribe at a relatively young age, Yo Tan Wa (Kingdom) has done almost the impossible for somebody her age, having conquered over half the Mountain Tribes of Qin and earning the title of Da Shang Zhao.
With dreams of becoming a Great General under Heavens
, Hyou (Kingdom) trained himself in swordsmanship
and combat for sole purpose of achieving it...
...demonstrating his intuition and ability as a leader by rallying Shou Bun Kun's escort soldiers.
From a tender age, Ei Sei (Kingdom) has inherited his grandfather's outstanding political foresight and wisdom. Ou Ki believed Ei Sei is the only King who can unify China.
Recognized by the elders of Clan Shiyuu to be the most talented practitioner of the Priestess Dance of her generation, Kyou Kai (Kingdom) is a dangerously fearsome and powerful master swordswoman at the age of 13...
...and without any longtime training, she's also shows her foresight as a Tactical Genius
Each of the Young Captains of the State of Qin (Kingdom) are considered "monsters" who possess astonishing talent in various fields of warfare such as tactical analysis, opportunity sense, skill adaptation and their own respective fighting styles...
...the youngest of the trio who was originally a servant and a slave, Shin of the Hi Shin Unit
trained himself in swordsmanship
alongside his fellow servant Hyou and in the course of his career he has defeated far more experience opponents...
...even before becoming a 100-man commander at the age of 14...
...Ou Hon, the extraordinarily adept leader of the Gyoku Hou Unit and powerful master in the art of Qiang/枪/Spear...
...receiving recognition from the chief of military affairs, Shou Hei Kun for his strategcial genius and acknowledge by Great General, Mou Gou to a prodigy even among their own elite family, Mou Ten of the Gaku Ka Unit's (Kingdom) brilliance in tacticial acuity was already on with a Great General then either of his peers...
...demonstrating when he saved the Qin's left wing from collapsing and was later promoted to General for his acts.
Receiving special strategist recognition from the Chief of Military Arts at the age of 14, Ka Ryo Ten (Kingdom) is the skillful tactician and strategist of the Hi Shin Unit.
Kou Yoku of The Thunder (Kingdom)
The youngest member of the Ten Bows of China, Haku Rei of Chu (Kingdom) holds the spot of 3rd at the young age of 18 for his powerful acrhery skills.
Sharrkan Amun Ra (Magi The Labyrinth of Magic) was prodigy in swordsmanship, able to defeat multiple strong adult robbers when he was 9 years old.
In addition to his magical aptitude, Negi Springfield's (Mahou Sensei Negima) intelligence is such that he became a homeroom teacher for high school girls at age 10.
Medaka Kurokami (Medaka Box) is a natural genius, progressing through infancy at an accelerated rate and able to surpass even adults in all fields before she was even two years old...
...and performing such feats as reading every single book in her parents' library in three months before she was even one.
Indra Ōtsutsuki (Naruto) was considered to be a prodigy, which led him to accomplish everything without the need for companions.
Sasori (Naruto) was considered as a child prodigy in the art of puppetry, mostly due to his loneliness in lack of parental love motivating his obsession in emotionless puppets.
As a young child who wasn't old enough to be a ninja yet, Zabuza Momochi (Naruto) effortlessly slaughtered over 100 Acemedy students without hesitation or pause earning the moniker of a Demon at a young age.
Itachi Uchiha (Naruto) has been heralded as a genius since childhood, as at age 13 he was selected to be a captain of ANBU Black Ops.
Reputed as the Second Coming of the Demon, Mangetsu Hōzuki (Naruto) was not only the youngest member of the previous generation of the Seven Ninja Swordsmen of the Mist but also mastered all of their individual swords.
Before leaving the Leaf Village, Sasuke Uchiha (Naruto) was hailed as a genius and was one of the most skilled fighters
of the village.
Boruto Uzamaki (Boruto: Naruto Next Generations) not only mastered three nature styles at the age of twelve but was also deemed as a chunin level ninja despite being a genin and well above his class by Kakashi Hatake himself.
Sarada Uchiha (Boruto: Naruto Next Generations) was able to master the Uchiha Fire Release at a very young age, inherited her mother intelligence and Chakra Enhanced Strength while also awakened her Sharingan at the age of 11 and inheriting her father's prodigious talent as an Uchiha.
Himawari Uzumaki (Boruto: Naruto Next Generations) not only awakened her Byakugan at a younger age then her mom and aunt, but also mastered use of the gentle fist on her very first try.
Tony Tony Chopper (One Piece) had become an outstanding doctor at the age of 15.
Even at the young age of 15, Kyros (One Piece) was already proficient in combat having fought an entire gang by himself and eventually becoming recognized as the strongest gladiator of Dressrossa colosseum at age 24.
Rob Lucci (One Piece) was a prodigy in the Rokushiki martial arts, he could slay 500 soldiers when he was only thirteen years old.
At the beginning of his career, Monkey D. Luffy (One Piece) fought and defeated various powerful pirates of the East Blue, becoming the most wanted man of its seas at the age of 17, the youngest of the Worst Generation, and one of the strongest pirates of all time, being recognized as a Yonko at the age of 19.
Sabo (One Piece) is one of the most powerful fighters of the Revolutionary army and the youngest.
Minks (One Piece) are natural born warriors from birth.
All Hunt Grount (One Piece) is prodigious marine soldier, his great fighting prowess allows him to become a Marine Captain at age 17.
Charlotte Linlin (One Piece) was born immensely powerful, able to overpower giants even at the age of 5.
Charlotte Katakuri (One Piece) is the second strongest member of the Big Mom Pirates, having never lost a single battle since the day he was born, until he finally tasted defeat at the hands of Monkey D. Luffy.
Yukari Sendo (Rosario + Vampire) is smart enough to attend high school at age 11.
Those who have been members of Elite Ten Council (Shokugeki No Soma) have always been the best of their generation when it comes to cooking, usually display their talents at a young age.
Erina Nakiri (Shokugeki No Soma) is a child prodigy able to speak at infant stage and gifted with unique ability called "Gods Tongue", making her genius in her academy. She even became the director of Tōtsuki Culinary Academy itself while still a 1st year high school student.
Even before becoming the 62nd successor to the Hokuto Shin Ken, Kenshirō Kasumi (Fist of the Blue Sky) was already a full-fledged martial arts master by the age of 3.
Raoh (Fist of the North Star)
his brother Raoh train daily, Toki (Fist of the North Star) demonstrated his own fighting ability by brutally beating a hunter who killed his pet dog and soon begin training in Hokuto Shin Ken/Big Dipper God Fist
and was considered by many to be the next successor due his elegent form in the martial art.
As a child, Kenshiro (Fist of the North Star) watched his adoptive brothers train in the art of Hokuto Shin Ken/Big Dipper God Fist and decided to join them in the fight to become the successor. Despite being younger and more naive than his older brothers, Kenshiro was a promising student who ultimately earned the title of successor.
Juza of the Clouds (Fist of the North Star) was considered the most gifted and powerful of the Nanto Goshasei at a early age.
Upon the birth of Sinbad (Magi: Adventure of Sinbad), Magi from all over the world sensed a great power had arrived in the world, referring to it as a "miracle child".
Christopher Thorndyke (Sonic X)
A-Rank Blazers (Rakudai Kishi no Cavalry) are destined for greatness and always display amazing amounts of talent and power even in their youth. Both Nene Saikyo and Kurono Shinguuji were noticeably stronger than most adults when they were middle school and rose to become some of the strongest Mage Knights in the world as adult.
As a child, Stella Vermillion (Rakudai Kishi no Cavalry) was born with thirty times the amount of magic power as normal Blazers and has the potential to become one of the strongest.
Shin Walford (Kenja No Mago) has tremendous talent in magic since childhood, even surpassing his legendary grandparents in terms of Spell Creation.
Yoh Asakura, Tao Ren, Usui Horokeu, Lyserg Diethel and Chocolove McDonell (Shaman King) are five exceptionally powerful Shaman prodigies destined to become the guardians of the Five Grand Elemental Spirits...
...Yoh Asakura destined guardian of the Spirit of Earth was stated to be the only Asakura descendant who is on pair with Hao...
...Tao Ren destined guardian of the Spirit of Thunder was considered the greatest Shaman produced by Tao Family despite his young age...
...Usui Horokeu/Horohoro destined guardian of the Spirit of Rain has power and talent on pair with Yoh and Ren...
...Lyserg Diethel destined guardian of the Spirit of Fire, was the smartest of the five his genius intellect and Shamanic powers surpassing most veteran Shamans...
...Chocolove Macdonell destined guardian of the Spirit of Wind was the strongest of the five despite their similar age and talents.
Both Magialca Zen Vanfrick (left) and Singlen Shelbrit (Right) (Undefeated Bahamut Chronicle) have always mastered everything they were taught since they were young and continue to advance until they became two of the most powerful and cunning Drag-Knights in the world.
While only months old, Filo (Rising of the Shield Hero) can easily master advance techniques that normally take months to years to learn and has already proven herself quite the fighter.
Despite being bedridden and not receiving any formal training until she around 10, Atla (Rising of the Shield Hero) is natural fighter who can casually defeat her older brother with little more than a jab,
Shizuku Yaegashi (Arifureta Sekai Saikyou) has been a genius practitioner in Kendo and Kenjutsu since a tender age of 4.