Soji Okita

the one who cloned soji is Kichisaburo.

The "clone" is actually a young assassin named Kichisaburo, who bears a striking physical resemblance to Sōji Okita. Seiga uses Kichisaburo to commit murders in Kyoto while disguised as Okita to frame the Shinsengumi for the crimes.

personality: Submissive and Loyal: He is depicted as a tool for Seiga no Chujo, following orders without question or personal ambition. He acts as a "doll" or a performer for his master's entertainment and political schemes. Malleable Identity: He is a master of mimicry, capable of perfectly imitating Sōji Okita's appearance and mannerisms to deceive both witnesses and even those who know Okita, like Hotaru. Emotionally Detached: Unlike the real Okita, who hides deep turmoil behind a cheerful smile, Kichisaburo appears largely hollow, lacking his own personal drive or the "demon-like" killing intent of the real Shinsengumi captain. Vulnerable: In the climax of his arc, he is treated more as a victim of Seiga's manipulation than a true villain. During a battle in Episode 17, Seiga even sacrifices himself to shield Kichisaburo from fire, suggesting Kichisaburo was viewed as a precious, albeit disposable, object.

Sōji is The Captain of the First Unit and a legendary swordsman. While cheerful and kind to Tetsu, he is a lethal fighter who suffers from tuberculosis, he's also a member of the Shinsengumi.

Characteristics:

Charismatic and Cheerful: Generally described as smiling, kind, and polite to friends and enemies alike, often bringing laughter to others. Ruthless Swordsman: Despite his friendly nature, he was a formidable, strict, and quick-tempered teacher (Jukutou) and a cold-blooded killer in combat. Devoted to Loyalty: He was intensely loyal to Shinsengumi commander Isami Kondo, often imitating him and placing his duty above all else. Sarcastic and Mischievous: Known to enjoy pulling pranks on fellow members, particularly Hijikata Toshizo. Resilient: Even while suffering from tuberculosis, he maintained a positive, often flippant attitude towards his illness, continuing to train and fight.

appearance: tall, long indigo hair, when he's fighting, he make a ponytail, and when he's not fighting, he let it down, fair skin, gray eyes, beautiful, Handsome in a feminine way.