Izuna

Biodata

Feature	Details
Name	Izuna (泉奈)
Gender	Male
Affiliation	Uchiha clan
Occupation/Role	Warring States-era shinobi; soul-fragment mentor to Uchiha Qingyu
Status	Deceased; persists as a soul fragment residing within Qingyu's mind 2
First Appearance	Chapter 2

Power Progression

Stage / Realm / Level	Chapter	Notes
Soul Fusion Rate: 17%	2	Izuna's fragment is detected within Qingyu alongside Tobirama's at the start of their symbiosis.
Soul Fusion Rate: 19%	11	The rate rises after Qingyu fights and makes decisions under the two souls' guidance.
Soul Fusion Rate: 23%	20	Further increases after Qingyu's intensive training and successful live-combat use of Water-Fire Rotation.

Background / History

Izuna was an Uchiha shinobi from the Warring States period and the younger brother of Madara Uchiha. In a recovered memory, the brothers spar as youths: Madara pushes Izuna to improve his feints, close-range attacks, and shuriken work before teaching him the Uchiha-style ultimate throwing technique, Eight Light Return. Izuna promises Madara that he will protect himself and the clan if Madara is ever gone. 12

His final memory ends at the arrival of Tobirama Senju's Flying Thunder God Slash. Izuna holds Tobirama responsible for his death, while Tobirama claims not to remember events after unleashing the attack. Izuna later died in war and left his Mangekyo Sharingan to Madara. 2 12

More than sixty years after the Warring States period ended, Izuna survives only as a soul fragment inside twelve-year-old Uchiha Qingyu. His fragment becomes fused to Qingyu's consciousness and acts as one of Qingyu's internal mentors, though Qingyu retains authority to forcibly silence him through the system. 2 3

Appearance

Izuna currently has no physical body, appearing only as a consciousness within Qingyu and through memory fragments. In his Warring States-era memory, he appears as a young Uchiha with straight black hair. 11

• Possessed sharp eyes and an intense expression during combat. 12
• Was approximately thirteen or fourteen during the recorded spar with young Madara. 11

Personality

Izuna is direct, demanding, and intensely combat-oriented. He favors decisive initiative, explosive power, and ending a fight quickly; he considers excessive caution and slow training methods signs of weakness. His instruction is harsh and frequently insulting, but it is grounded in battlefield experience acquired during the Warring States period. 3 4

He has a deeply ingrained Uchiha pride. Izuna is angered by what he sees as the modern clan's indecision and marginalization, arguing that the Uchiha must either integrate fully into Konoha or become strong enough to stand independently. 20 21

Despite his aggression, Izuna is attentive to Qingyu's limits. He agrees to rest when Qingyu becomes mentally exhausted, warns him against reckless risks after his fight with Neji, and supports Qingyu's efforts to create a combat style that combines Uchiha and Senju teachings. 7 13 31

Abilities & Skills

Uchiha-Style Shurikenjutsu

Izuna is a master of Uchiha-style throwing techniques and trains Qingyu in curved trajectories, subtle wrist adjustments, enemy-path prediction, and combat-oriented throwing. 3 7

• Teaches Eight Light Return, a technique based on repeated mid-air redirection and trajectory calculation. 7 12
• Helps Qingyu develop curved shuriken attacks, including the Uchiha-style Three Swallow Return. 7 9
• Emphasizes feints that force an opening for a genuine killing strike. 12
• His training prioritizes practical lethality over textbook precision. 3

Fire Style Mastery

Izuna can provide Fire Style instruction and teaches Qingyu fire-nature transformation, fire-infused shuriken use, and Uchiha-style offensive principles. 3

• Advocates using Fire Style to create explosions, flames, and openings for a direct assault. 6
• Recognizes that improved Fire Style techniques can reduce chakra waste, noting Madara's more efficient Great Fireball formulation. 18
• Supports Qingyu's attempt to combine Fire and Water Release, acknowledging that the two attributes can create new possibilities rather than merely oppose each other. 13

Sharingan and Genjutsu Theory

Izuna's available knowledge includes Sharingan application theory, Three-Tomoe combat principles, genjutsu basics, and the theoretical principles of Izanagi at high compatibility. 3

• Urges Qingyu to develop toward a Sharingan-based explanation for his sudden improvement. 7
• Values visual combat awareness and sees ocular techniques as central to Uchiha strength. 7 26
• Cannot grant Qingyu a fully awakened Sharingan; Qingyu instead receives only limited perception boosts from Izuna's soul fragment. 9

Battlefield Experience and Combat Instruction

Izuna's guidance reflects Warring States-era survival tactics: stealth, aggressive interception, terrain reading, and exploiting a weakened enemy. 4 5 7

• Identifies concealed routes and assesses battlefield opportunities alongside Tobirama. 5
• Favors striking exhausted opponents and capitalizing immediately on openings. 7
• Offers rapid close-combat advice when Qingyu is threatened, including chakra-enhanced thrusting techniques. 29
• His soul fragment grants Qingyu a slight improvement in dynamic vision during combat. 9

Relationships

• Madara Uchiha — His older brother, training partner, and greatest source of loyalty. Madara taught him Eight Light Return, while Izuna pledged to protect both himself and their clan. 12
• Tobirama Senju — Long-standing enemy whom Izuna blames for his death. The two continue to argue constantly within Qingyu, but cooperate when Qingyu's survival requires it. 2 3 11
• Uchiha Qingyu — His host and student. Izuna teaches Qingyu Fire Style, Uchiha shurikenjutsu, footwork, and combat instincts while pushing him toward greater strength. 3 7 13
• Uchiha clan — Izuna remains invested in the clan's future, but is contemptuous of its modern political weakness and inability to decisively resist marginalization. 19 20 21
• Shisui Uchiha — Izuna considers Shisui a genuine powerhouse with unusually open-minded qualities for an Uchiha, and is impressed by the speed and intent behind Shisui's blade work. 17 22

Story Role / Major Arcs

• Dual Soul Symbiosis — Izuna awakens as a soul fragment in Qingyu's mind and immediately resumes his hostility toward Tobirama. 2
• Chunin Exam Training — He becomes Qingyu's nighttime Uchiha-style instructor, focusing on shurikenjutsu, Fire Style, and footwork while competing with Tobirama's more methodical approach. 3 7
• Forest of Death — Izuna's battlefield judgment helps Qingyu detect threats, choose concealed routes, and make tactical decisions during the first examination stage. 4 5 7
• Memory Fragment — Qingyu views Izuna's memory of sparring with Madara, gaining insight into Izuna's training, loyalty, and the origin of Eight Light Return. 11 12
• Water-Fire Rotation Development — Izuna supports Qingyu's fusion of Fire and Water Release, accepting that the two opposing styles can form a distinct new combat method. 13 20
• Uchiha Political Crisis — He analyzes the Uchiha clan's declining position in Konoha and urges Qingyu to understand the clan's factions rather than blindly trust them. 18 20 39
• Sunagakure Exchange Preparation — Izuna continues training Qingyu in advanced shurikenjutsu and survival-minded combat before the joint event with Sunagakure. 39 45 46

Notable Quotes

“Starting tonight, special training! First, your embarrassing Fire Style—” 3

“What kind of delicate control does the Uchiha fighting style need? It's about burst! Power! Defeating the enemy in one strike!” 3

“Even if it's dangerous, we look!” 18

Trivia

• Izuna and Tobirama argue over matters as minor as Qingyu's breakfast, collar height, and where to strap his kunai. 4
• He initially regards modern ninja training as dangerously lax compared with the Warring States period. 4
• Izuna is unusually receptive to Shisui's teaching philosophy, admitting that Shisui's method is more open-minded than Madara's instruction had been. 25