|Weapons||Nagasone Kotetsu (Katana)|
Kikuichimonji Norimune (Katana)
|Manga Debut||Act 56|
|Anime Debut||Episode 31|
|Voice Actor||Tara Jayne|
Seta Sōjirō was the fastest member of the Juppongatana. He was the right-hand man of Shishio Makoto and the most skilled swordsman among his crew. He was usually seen by Shishio's side. When not with Shishio, he was off on missions such as assassinations or gathering the other Juppongatana. His nickname was "Sojiro the Tenken". He believes in Shishio's philosophy that only the fittest survive (social Darwinism). "If you're strong you live, if you're weak you die". His favorite sword was the Kikuichimonji-norimune, which was cracked by Kenshin's sakabato during a contest of Battōjutsu. He is the one responsible for the assassination of Okubo Toshimichi.
Sojiro is normally seen smiling, with seemingly no emotion. In actuality, he subconsciously suppresses his emotions, making him difficult to read in combat, as stated by Kenshin. This facade gradually erodes when he realizes how strong of an opponent Kenshin is. He also adheres to the philosophy of "the survival of the fittest" and believes it to be an absolute truth. His dedication to this belief, however, leaves him emotionally vulnerable and naive when another's differing idealogy conflicts with his own. When his true emotions surface, he appears to be unnerved, infuriated, and almost insane. This is a direct result of spending over a decade suppressing his feelings. However, after the Kyoto Arc, he appears to have calmed down somewhat and gone back to his happy-go-lucky self..
During his time under Shishio's tutelage and service, Sojiro seems to regard him as a combination of master, god, and foster father.
Childhood EditSojiro was an illegitimate son of a rice business man and prostitute, and was left in the care of his family brother. As a child, Sojiro was abused and beaten by his family, and he would smile instead of cry to make them stop temporarily. One night, he ran into Shishio Makoto, when he sliced a government official in half. Instead of killing him, Shishio took shelter in a shed and Sojiro would bring him food and bandages. He gave Sojiro a wakizashi to protect himself by killing his family, but he thought being killed by a sword would hurt too much so he hid it under the porch. When his "family" found out Sojiro was harboring a wanted criminal, they planned to kill the boy and turn Shishio in. Sojiro ended up slaughtering the five adults with great speed and strength, the result of believing what Shishio told him; "The strong live and the weak die". Afterwards when he stood in the rain, he seemed to be smiling about it, but he was actually crying. He decided to go with Shishio.
In Rurouni Kenshin Edit
In his first appearance, Sojiro killed Okubo Toshimichi under Shishio's order, his abilities made his presence unnoted. After Kenshin defeated Senkaku, Sojiro engages in a fast duel with him, resulting in a tie. Then, Shishio ordered Sojiro bring to him The Ten Swords from the East side of Japan.Sojiro was the last member of Juppontagana that Kenshin must defeat before facing Shishio. He used Shukuchi's less potent forms to move fast enough to hit Kenshin, both managing to dodge the Kuzuryusen and slash him in the back using merely the second step behind the true Shukuchi. As the fight dragged on however, Kenshin made Sojiro question the reasons that made him fight alongside Shishio, and this made Sojiro release his true emotions, allowing Kenshin to predict his moves and discover his advantages. Sojiro got mad and rendered his emotional blankness null; the battle reaches the climax when Sojiro challenges Kenshin to do a last technique to put an end in the duel, Sojiro used Shuntensatsu, the combination of the full Shukuchi and his Battojutsu against Kenshin's Amakakeru Ryū no Hirameki. The two attacks were comparable in overall speed, but Kenshin's ougi was far stronger and instantly broke Sojiro's sword and left him battered. Sojiro declared that his loss showed he had been wrong, but Kenshin instead said that the victor isn't right by default and he must discover his own truth before leaving the room to face Shishio. Sojiro discovered the key to Amakakeru Ryū no Hirameki and informs Yumi to tell Shishio. Sojiro asked for Yumi to return the Wakizashi given to him by Shishio. Then, he leaves the Juppongatana and became a traveler once Shishio died, intending to travel the next 10 years to discover his own true self.
- Shukuchi (Reduced Earth) Sojiro moves at beyond god-like speed, only showing his footsteps crashing into the floor. This also allows him to run on walls. He is also shown to use reduced forms of the technique, naming them (X) steps below shukuchi. Shukuchi is revealed to be the reason why he could keep up with Okubo and kill him in his carriage.
- Shuntensatsu (瞬天殺) (Instant Heaven Kill) This is the only attack Sojiro named himself. It involves using Batoujutsu combined with the speed of Shukuchi. It is named for its ability to instantly kill its target victim, a process that wouldn't even be painful due to the speed with which the target is dispatched. Sojiro was supremely confident in its ability to demolish Kenshin, but by combinining his god-speed with the Ougi used to defeat Aoshi earlier on (Amakakeru Ryu no Hirameki), Kenshin won the battle.
- Shishio Makoto - Mentor and Father figure: Sojiro first met him as a child when Shishio suffered burns and Sojiro merely smiled when asked if he was not afraid of death. Once Shisho realized that Sojiro was abused by his family he gave him a wakizashi as payment for the food and bandages he had recieved, which Sojiro used to kill his family once they tried to kill him. Sojiro learned swordsmanship from Shishio, and regarded him as a combination of both father and god.
- Komagata Yumi - Sister/Mother figure: Sojiro became close to Yumi who, like his mother, was a prostitute. She showed much concern for his wellbeing, even after he resolved to leave their faction. He had a high regard for her personally.
- Himura Kenshin - An enemy to Sojiro, since the latter was Shishio's top henchman and wanted to end Kenshin's life with his own hands. Eventually, after a hard-fought battle, Sojiro loses to Kenshin in their second battle (after a draw in the first) and his adversary tells him that he must find for himself, the correct path in life, the way he himself did.
In Live Action filmEdit
A 5 mintue preview of the film shows that Sojiro was responsible for the kidnap of Kaoru, under the orders of Shishio.