Hakufu Sonsaku anchors the *Ikki Tousen* franchise across manga, anime series, and OVAs. She is the daughter of Goei and Bundai Sonken, cousin to Koukin Shuuyu, sister to Sonken Chūbō, and adoptive sister to Shōkyō in the anime continuity. Her lineage traces back to the ancient Chinese warrior Sun Ce (Sonsaku), the "Sho Haou" or "Little Conqueror" who perished in 200 AD. This reincarnation binds her to a destiny of conquering rival schools in Kantō. Physically, Hakufu has a voluptuous figure (93-56-88 measurements), long strawberry-blonde hair covering her ears and reaching her back, with prominent bangs and two upward-protruding strands. Her eyes are green. She consistently wears Nanyo Academy’s uniform: red plaid skirt, yellow sweater vest over a white collared shirt, white socks, and brown loafers. Her personality blends cheerfulness and energy with naivety and impulsiveness. She often displays low intelligence and poor common sense, misunderstanding others’ intentions or strategic contexts. Though warmhearted and kind, she erupts in extreme anger when frustrated or denied. Hakufu fights purely for the thrill of combat, rejecting killing or unnecessary violence. She resists her conqueror destiny but gradually accepts leadership to protect allies. She reacts defensively to being called "stupid." In combat, Hakufu initially ranks as a low-tier fighter (E/D-rank by magatama standards) but her true strength surpasses this: without her dragon’s power, she operates at A-rank (gold magatama), and with her dragon-activated *Suiryuuken* form, she reaches "Special S-rank." Her dragon, Suiryuu (Water Dragon), grants immense power but risks overwhelming her consciousness, triggering a berserk state. Key abilities include predicting opponents’ moves via chi flow, executing "delayed strikes" (invisible chi bombs detonating post-feint), and "inner strikes" (internal damage via chi penetration). She perfectly replicates any technique after seeing it once, applicable in martial arts and swimming. From Master Chosho, she inherits chi magic knowledge for instinctive healing and purification—evidenced when extracting evil chi from Koukin, leaving a skull-shaped mark creeping toward her heart. Her story arc evolves across media. In the manga, she transfers to Nanyo Academy, defeats 27 students on arrival but loses to B-ranked Gakushuu. Major battles involve Ryomou Shimei (where her neck breaks but she retaliates savagely) and Kouha Kannei. Training with Genjou Kakouton accelerates her growth through mastering basics. Later, she inherits Nanyo’s leadership and learns Water Dragon Fist. After Saji Genpou’s apparent death, she adopts a serious, leader-like role while retaining airheaded tendencies. The manga explores her containment of evil chi and conflicts with rival schools. Anime adaptations diverge: *Dragon Destiny* depicts her challenging Sousou of Kyosho Academy to end regional violence. After Kanu Unchou substitutes in their duel, Hakufu’s dragon possesses her, leading to Sousou’s near-fatal blow. Presumed dead, she revives via Ukitsu’s sacrifice, regaining her soul and full dragon control. She later teams with Ryuubi to defeat Sousou at Chibi. *Great Guardians* shows her resisting Saji’s illusions and working with Ryomou at a cosplay café to fund a global "battle tour." *Xtreme Xecutor* continues her role in escalating conflicts. OVAs *Western Wolves* and *Shin Ikki Tousen* depict ongoing struggles, leadership, and her battle against lingering evil chi. Her development shifts her from a carefree fighter to a reluctant leader prioritizing friends and school protection. Core traits endure—impulsiveness, combat-love, and ditzy moments. The evil chi’s progression and dragon’s influence remain unresolved threats.