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Koushirou[2] is a master swordsman and was the teacher of Roronoa Zoro. He is also the father of the late Kuina[3] and son of Shimotsuki Kozaburo.[4] He is the master of Isshin Dojo in Shimotsuki Village.[1]

Appearance[edit | edit source]

Koushirou has black hair tied back in a long ponytail, his face is wrinkled and wears glasses with circular frames. He always wears a gray yukata and sometimes he has a beige haori over it with two crossed swords on the left breast.[5]

Gallery[edit | edit source]

Koshiro 22 Years Ago.png
Koushirou at age 29.
Koshiro Anime Concept Art.png
Koushirou's Concept Art from the anime.

Personality[edit | edit source]

He was a believer that females are naturally weaker than their male counterparts and are therefore unsuitable to be warriors.[6] Koushirou deeply appreciate talent as shown when he noted that as long as Zoro valued his swordsmanship he did not care if he had became a pirate.[7] However, he was rather dismayed that the students of his dojo hoped to become great pirates like Zoro and started practicing Santoryu to better emulate him.

Although he is always seen smiling, he gives the impression of being a mostly emotionless person. Koushirou's reaction to his daughter's death was just a comment that "humans are fragile" when telling Zoro that she died, though it is possible that he was masking his pain.[8]

Abilities and Powers[edit | edit source]

He is skilled enough with a sword that he can teach others to use it.[5] Having learnt from his father a samurai,[citation needed] Koushirou has knowledge of swordsmanship techniques known only in Wano[9] which he would pass on to Zoro.[10]

History[edit | edit source]

Past[edit | edit source]


The following events are Non-Canon and therefore not considered part of the Canon story.


One day, a young Zoro came to his dojo for a challenge. Koushirou pitted Zoro against his daughter Kuina and stated that if Zoro loses, he would become a student of the dojo. Zoro accepted the challenge and lost and became Koushirou's student as agreed.[6]

One night, Koushirou discussed about Zoro's progress with a fellow teacher and was confident that Zoro would one day surpass Kuina. Kuina, having overheard this conversation, became outraged saying that she would be the world's greatest swordsman. Koushirou stated that as a woman, Kuina cannot be the world's greatest swordsman, causing her to be distraught.[6]


Concludes non-canon section.


On the day after Zoro and Kuina made their vow, Kuina fell down the stairs and died. At Zoro's request, Koushirou gave him her Meito, Wado Ichimonji.[8]

At least once, Isshin Dojo helped the Revolutionary Army by providing them food and supplies. A man with a large face was seen and Monkey D. Dragon said that the army received food from the dojo.[11]

Water 7 Saga[edit | edit source]

Post-Enies Lobby Arc[edit | edit source]

After the Enies Lobby incident, Koushirou was seen again in his dojo when his students were asking him about Zoro. He wished Zoro to go on ahead and fulfill his dream. Koushirou also stated that as long as Zoro treasures his sword, it will not matter what person he becomes.[7]

From the Decks of the World[edit | edit source]

After the news of the Straw Hat Pirates spread across the world, Koushirou smiled and put a copy of the newspaper on Kuina's grave.[12]

From the Decks of the World: The 500,000,000 Man Arc[edit | edit source]

After the Straw Hats' victory at Dressrosa, Koushirou was dismayed that his young students began to imitate Zoro by practicing Santoryu and taping their left eyes shut.[13]

Anime and Manga Differences[edit | edit source]

Koushirou with graying hair in the anime.

At the end of the anime's flashback of Zoro's past, Koushirou was shown with bits of gray hair when Zoro left Shimotsuki Village.[6] Yet, his hair was fully black when Zoro received his second bounty. This is most likely due to him not yet having been seen outside of Zoro's flashback in the manga at the time.[7]

In the manga, his actions are limited to Zoro's flashback while in the anime his role is expanded. Kuina's increased fighting potential is noted by him because of her rivalry with Zoro, while in the manga he makes no statement. His traditional values are also touched upon as he contemplated making Zoro his heir rather than his own daughter Kuina simply because of her gender.[6]

Merchandise[edit | edit source]

Video Games[edit | edit source]

Playable Appearances[edit | edit source]

Non-Playable Appearances[edit | edit source]

Trivia[edit | edit source]

Koushirou's cameo in the crowd.

References[edit | edit source]

  1. 1.0 1.1 One Piece Yellow: Grand Elements .
  2. 2.0 2.1 2.2 2.3 2.4 Vivre Card - One Piece Visual Dictionary (Card #0041), Koushirou's information is revealed.
  3. One Piece Manga and Anime — Vol. 1 Chapter 5 (p. 9-10) and Episode 19.
  4. SBS One Piece Manga — Vol. 96 (p. 80).
  5. 5.0 5.1 One Piece Manga and Anime — Vol. 1 Chapter 5 (p. 10) and Episode 19.
  6. 6.0 6.1 6.2 6.3 6.4 One Piece Anime — Episode 19, Zoro's flashback in the anime.
  7. 7.0 7.1 7.2 One Piece Manga and Anime — Vol. 45 Chapter 440 (p. 5) and Episode 324, Koushirou talks to his new students.
  8. 8.0 8.1 One Piece Manga and Anime — Vol. 1 Chapter 5 (p. 15) and Episode 19.
  9. One Piece Manga and Anime — Vol. 93 Chapter 939 (p. 15) and Episode 936.
  10. One Piece Manga and Anime — Vol. 21 Chapter 194 (p. 15-16) and Episode 119.
  11. One Piece Manga and Anime — Vol. 60 Chapter 589 (p. 7) and Episode 504.
  12. One Piece Manga — Vol. 63 Chapter 617, cover story: From the Decks of the World Vol. 5.
  13. One Piece Manga — Vol. 81 Chapter 807, cover story: From the Decks of the World: The 500,000,000 Man Arc Vol. 3, Koushirou shows dismay that his young students have begun imitating Zoro by practicing Santoryu.

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