Sōgo Okita captains the Shinsengumi's first division. Orphaned young, he was raised solely by his elder sister Okita Mitsuba in their village. Her indulgence after their parents' death fostered his aloof, distant nature, leaving him friendless until Isao Kondō took him into his dojo. Okita developed profound loyalty toward Kondō, seeing him as a brother. This bond fractured when Tōshirō Hijikata joined; Okita perceived Hijikata as stealing Kondō's attention and later resented him for rejecting Mitsuba. This resentment became a lasting grudge, fueling Okita's ambition to usurp Hijikata as vice-commander. He followed Kondō to Edo to establish the Shinsengumi, though Hijikata's intervention prevented Mitsuba from joining. Okita exhibits a sadistic, manipulative streak, chaining individuals for "S&M play" and repeatedly attempting to assassinate Hijikata with weapons like bazookas or poison. Allies and enemies alike dub him "Prince of Sadists" or "King of the Planet of Sadists." Yet this cruelty masks deep-seated insecurity; he once confessed his sadism stems from inner weakness after a roller-coaster incident. Despite his callous exterior, he fiercely protects those he values, kneeling respectfully for Mitsuba and drawing his sword on officials who insult Kondō. He shows unexpected sensitivity, shouldering others' burdens—like absorbing hatred from the Rokkaku owner's daughter to shield her from painful truths—and despising exploitative systems like the Rengokukan fighting ring. Typically, he maintains a deadpan, disinterested façade, often neglecting duties while wearing a red sleep mask. However, he displays acute observation during missions and ruthless combat efficiency. His relationships reflect contradictions. He reveres Kondō, teasingly calling him "Gorilla" but remaining unflinchingly loyal—even threatening treason to protect him during political strife. His rivalry with Hijikata involves persistent assassination attempts, yet he acknowledges him as one of his "three rotten friends," alongside Kondō and Gintoki Sakata. Their bond includes grudging mutual respect forged in battle. With Kagura of the Yorozuya, he shares a competitive dynamic, dubbing her "China" and engaging in petty contests. He considers Sakata Gintoki a respected equal, collaborating to humiliate Hijikata and later admitting genuine friendship. His deepest bond was with Mitsuba; her terminal illness drove him to plead for her happiness and conceal her fiancé's rebel ties. Upon discovering the fiancé's betrayal, he killed him without hesitation. Mitsuba's death shattered his stoicism, reducing him to visible tears. In combat, Okita ranks as the Shinsengumi's most skilled swordsman, capable of slicing cars, deflecting sniper bullets, and demolishing concrete structures. His signature technique, the "Sandanzuki" ("Three Piece Thrust"), simultaneously targets multiple vital points. Though proficient with his katana—the "Kiku-Ichimonji RX-78" featuring an integrated MP3 player—he frequently wields unconventional weapons like a Shinsengumi-issued bazooka. His heightened strength lets him battle powerhouses like Kamui or Nobume Imai equally. His combat philosophy emphasizes efficiency, yet he hesitates to let innocents "be stained by blood," revealing a nuanced view of violence. The character draws loose inspiration from the historical Shinsengumi figure Okita Sōji, sharing swordsmanship prowess and sibling dynamics, but diverges significantly in personality and narrative role.