Hideki

Biodata

Feature	Details
Name	Hideki (英树)
Alias(es)	Ying Shu
Species/Race	Human; later discovered to be descended from the Senju Clan 36
Gender	Male
Affiliation	Konohagakure; Team 7 36
Occupation/Role	Genin; former Ninja Academy student; medical-nin trainee 8 36
Status	Alive 50
First Appearance	Chapter 1

Power Progression

Stage / Realm / Level	Chapter	Notes
Basic Water and Lightning Release	1	Performs the D-rank Water Release: Water Ball Technique and Lightning Release: Lightning Flash simultaneously despite his injured hand.
Initial Hydrogen Release	2	Uses Lightning Release to electrolyze water into oxyhydrogen, then has Obito ignite it; later stores the gas in a bottle for use in combat.
Rasengan water-balloon stage	7	Bursts water balloons with chakra control—one in each hand—completing the second stage of Rasengan training.
Rasengan basics and Mystical Palm Technique	8	Masters the Rasengan’s fundamentals and successfully treats a patient with the Mystical Palm Technique; cannot sustain multiple Rasengan because of chakra limitations.
Yang-infused Hydrogen Release	10–11	Uses Yang Release to create water that can be electrolyzed without an environmental water source, making Hydrogen Release faster to form without lowering its power.
Hand-sign-free Rasengan	15	Destroys Kakashi’s Earth-Style Wall with a Rasengan formed without hand signs.
Refined Hydrogen Release	16	Produces hydrogen in under ten seconds with Yang Release, Water Release, and Lightning Release before Obito ignites it with Great Fireball.
Layered elemental combat	25	Combines Water Release: Water Chain Bullet with Lightning Release: Lightning Explosion, using Hydrogen Release to amplify the attack against the old man’s Earth Release.
Three-person Hydrogen Release	28, 32	Develops the planned Great Fire Dragon: Hydrogen Release Cannon with Kakashi and Obito; later triggers Hydrogen Release: Nuclear Peace Barrage during the graduation assessment.
Senju chakra extraction	38	Uses the Senju Clan’s specialized extraction method to access his Sage Body’s immense chakra reserves more rapidly.
Water Dragon Bullet	48	Uses deception, Shadow Clones, and smoke to successfully unleash Water Release: Water Dragon Bullet against eight Root youths.
Spiral Small Water Ball	50	Creates a rough Water Release variation of the Rasengan, though it proves no stronger than an ordinary Small Water Ball.

Background

Hideki transmigrated into the body of a five-year-old boy in Konoha Year 40. One hundred days after arriving, he was living alone in an isolated forest house on Konoha’s outskirts, shortly after the Ninja Academy opened and as the Third Shinobi World War began 1. His parents were dead, leaving him without a surname, a small house, and beginner ninjutsu scrolls 1 14.

His right hand was severely scarred before the story begins. Konoha Hospital divided its treatment into three medical-ninjutsu sessions to avoid harming his young body through excessive chakra stimulation 1. The injury did not stop him from training; he used Water Release and Lightning Release while still bandaged and treated his recovery as part of the cost of gaining power 1.

Hideki initially considered himself an ordinary civilian with weak chakra reserves, but his precise control and later-discovered Senju ancestry overturned that assumption. His Yang Release affinity allowed him to learn medical ninjutsu quickly, while the old man’s training and the Senju chakra-extraction method revealed the scale of his reserves 8 24 36 38.

Appearance

Hideki is introduced as a five-year-old boy with a small right hand covered in scars and bandages following medical treatment 1. Classmates consider him notably handsome, contributing to his popularity among the girls at the Academy 5.

• His right hand bears severe scars from injuries sustained before his transmigration 1.
• His hair is singed while shielding Obito from his own Hydrogen Release explosion 10.
• After a month of harsh training, he becomes darker, thinner, and more capable-looking; he also begins carrying a ninja tool pouch 25.

Personality

Hideki presents himself as quiet, obedient, and academically gifted, but privately thinks and acts like the university student he was before transmigrating. He approaches ninjutsu as an experimental discipline: observing phenomena, forming hypotheses, testing dangerous methods, and using chemistry to develop Hydrogen Release 1 2.

He is calculating and sarcastic, often relying on bluffs, loopholes, clones, smoke, and feigned weakness rather than direct confrontation. His willingness to trick enemies is paired with a practical view of survival that hardens after he sees Obito nearly beaten to death 9 10 48.

Despite his manipulative streak, Hideki is fiercely protective of his companions. He repeatedly intervenes for Obito, recruits Kakashi into their group, and pushes Kakashi to turn fear over Sakumo Hatake’s fate into determination 8 18 26 27.

Abilities & Skills

Hydrogen Release

Hideki’s self-developed composite ninjutsu electrolyzes water with Lightning Release, producing explosive hydrogen and oxygen gas that is ignited with Fire Release. He considers it an artificial “Hydrogen Release,” though it is explicitly a combination ninjutsu rather than a bloodline limit or distinct chakra nature 2 7 18.

• Initially requires naturally occurring water, precise Lightning Release, and an external flame or delayed ignition device 2 7.
• Yang Release allows him to create persistent water that can be electrolyzed, avoiding dependence on nearby water sources 10 11.
• Its explosions can incapacitate multiple opponents and heavily injure trained shinobi 10 16.
• Wind Release can disperse or redirect its hydrogen before ignition, as Uchiha Retsu demonstrates 20.
• With Kakashi and Obito, Hideki develops a three-person version combining Water Chain Bullet, Lightning Explosion, and Great Fire Dragon 28 32.

Rasengan

Minato teaches Hideki the Rasengan in exchange for an explanation of Hydrogen Release 6. Hideki’s exceptional chakra control lets him progress through its training unusually quickly.

• Completes the water-balloon stage while controlling a balloon in each hand 7.
• Masters the basics within a month, though his early chakra reserves prevent simultaneous Rasengan use 8.
• Forms Rasengan without hand signs and shatters Kakashi’s Earth-Style Wall in a single strike 15.
• Uses twin Rasengan in combat and coordinates the Double-Yellow Rasengan with a Shadow Clone during Team 7’s graduation assessment 19 32.

Water and Lightning Release

Hideki’s foundational elemental affinities are Water Release and Lightning Release. Their interaction forms the basis of Hydrogen Release.

• Water Release: Water Ball Technique — A D-rank utility technique that purifies water for washing and other daily uses; Hideki can alter its size and position with precision 1.
• Lightning Release: Lightning Flash — A basic Lightning Release used in his earliest electrolysis experiments 1 2.
• Water Release: Water Chain Bullet — A rapid-fire ranged attack later combined with Lightning Explosion and Hydrogen Release 25 48.
• Lightning Release: Lightning Explosion — An Orochimaru-provided technique that complements Water Chain Bullet 25.
• Water Release: Water Dragon Bullet — Used successfully to sweep aside eight Root youths and force their supervisor to substitute away 48.
• Water Release: Spiral Small Water Ball — An incomplete Rasengan-inspired Water Release variation whose power disappoints Hideki 50.

Yang Release and Medical Ninjutsu

Hideki possesses high compatibility with Yang Release, enabling him to learn healing techniques at an unusual pace 8.

• Mystical Palm Technique — He successfully heals a patient’s minor wound and continues medical training to support his future team 8 26.
• Yang Release: Small Water Ball — Creates a spinning, persistent water sphere that can be electrolyzed into hydrogen during combat 10.
• Yang Release is essential to his goal of creating water with enough physical substance to support Hydrogen Release 4 10.
• His healing skills also serve tactical purposes, including faking Obito’s injury during the graduation assessment 32.

Shadow Clones and Tactical Skill

Hideki learns the Shadow Clone Technique through Konoha Hospital staff and uses it for training, school avoidance, deception, and combat 11.

• His clones possess exceptional endurance; he can maintain one through a full school day and even creates Obito’s afternoon clone for him 28.
• He uses clones, transformations, smoke bombs, substitution, feigned techniques, and false injuries to create layered traps 31 32 48.
• A month of training with the old man improves his stealth, tracking, coded communication, intelligence gathering, battlefield analysis, and assassination precautions 25.

Equipment / Weapons / Items

• Ninja tool pouch — Carried after his month of special training 25.
• Kunai and Explosive Tags — Used for training and escape; many of Team 7’s tools originate from Kakashi’s household supply 25 31 48.
• Orochimaru’s elemental-ninjutsu scroll — Contains five elemental techniques suited to Hideki’s development 21 22.
• Water Release: Water Dragon Bullet scroll — Given by Hiruzen upon Team 7’s promotion to Genin 36.

Relationships

• Obito Uchiha — Hideki’s closest friend and earliest partner in Hydrogen Release experiments. Hideki repeatedly protects Obito and intends to alter the future to prevent his eventual downfall 1 10 19.
• Kakashi Hatake — Initially hostile Academy rival; later recruited by Hideki as both a teammate and the Lightning Release component needed for their three-person technique 5 18 36.
• Minato Namikaze — Trades Rasengan instruction for Hideki’s explanation of Hydrogen Release and later becomes Team 7’s guiding jonin 6 36.
• Kushina Uzumaki — Temporarily conducts Team 7’s bell test, accidentally receives Hideki’s attack, and protects the team from Root interference 38 39 44.
• Arutake Kumi — Nurse who treats Hideki’s injuries, helps him enter medical-ninjutsu training, and teaches him the Shadow Clone Technique 8 11.
• Nonō — Encourages Hideki’s medical-nin ambitions after recognizing his aptitude 8.
• Rin Nohara — Treats Hideki after the Uchiha alley fight and later becomes closer to him through his medical training 10 26.
• The mysterious old man — A probable Senju survivor who forcibly becomes Hideki’s harsh mentor, teaching him combat fundamentals and testing his resolve 13 23 25.
• Orochimaru — Takes an unsettling interest in Hideki’s chakra control and Hydrogen Release, saves him from Uchiha Retsu, and leaves him an advanced elemental-ninjutsu scroll 10 21.
• Hiruzen Sarutobi — Recognizes Hideki’s potential, supports his development, and seeks to keep him away from Danzo’s Root 7 36.
• Shimura Danzo — Seeks to recruit Hideki into Root because of his combat ability, creativity, and potential military value 32 36 48.

Story Role / Major Arcs

• Hydrogen Release’s creation — After being bullied alongside Obito, Hideki develops an explosive electrolysis-based ninjutsu and uses it in their escalating conflict with Uchiha children 1 2 10.
• Uchiha retaliation — His defeat of Uchiha Ruohuo draws the attention of Retsu and the Uchiha elders, forcing Hideki, Obito, and Kakashi to operate as a team against stronger opponents 17 20 21.
• Training under the old man — After destroying the old man’s tree, Hideki gains a demanding mentor who improves his physical conditioning, tactical abilities, and understanding of chakra nature transformation 13 24 25.
• Formation of Team 7 — Hideki brings Kakashi into his partnership with Obito, leads their coordinated graduation assessment against Minato, and becomes an official Genin under Minato’s command 18 31 32 36.
• Root conflict — Danzo’s interest turns Hideki into a target for surveillance, recruitment, and combat testing; Hideki resists Root through open defiance and deceptive battlefield tactics 36 38 44 48.

Notable Quotes

“Ninjutsu comes from life, yet rises above life.” 6

“My point is, there’s no need to imagine.” 24

“You need to man up, Kakashi! Even if Uncle White Fang really died in battle, he would have died bringing glory to Konoha!” 27