Obi Hajime (オビ肇) is the former head coach of the Koudoukan.
In his time in Koudoukan, he studied under Shimura Ken and was noted to be a sword genius throughout Edo. At a young age, he became the head coach of Koudoukan and he taught both Otae and Shinpachi.
His talent was widely known and was chosen as a student to study in space. But he was caught up in a accident at the Terminal where a transfer device exploded. He was warped into to Planet Biimu but half of his body was heavily damaged and he died in the process. However he was revived by the native Amanto and he became a cyborg.
Everybody assumed he died but he was travelling around the Galaxy learning sword techniques and challenging opponents.
He has long hair,and a big scar on the right side of his face going from his forehead to his cheek,he seems to be blind from his right eye and wears a Kimono a leopard spotted scarf and he is allways seen with a large dark cloak.
He seems to be a cheerful and fun person allways smiling and caring for his loved ones,showing great affection for shinpachi remarking that he had grown and had become a bit stronger. When the machines took over his body he went under another personality that makes him be cold toward everyone in earth.
Strength & Abilities
He studied the Tendoumushin sword-fighting style (天堂無心流 - Tendou Mushin Ryuu).
After his accident, he became a cyborg. His hand was able to create a Beam Saber.
- Shimura Ken: Hajime looks up to Shimura Ken. He modestly claims that he couldn't be compared to his mentor. He regrets abandoning the school and leaving Otae and Shinpachi to carry the burden of protecting the Dojo on their own.
- Shimura Shinpachi:He views Shinpachi as a student and as his little brother, often referring to him as Shin Boy.
- Shimura Tae: He views Otae as a student and a sister. He is unware that he is Otae's first love and intially believes that Gintoki is her boyfriend.
- Sakata Gintoki: He views Gintoki as a student and as a member of the saber style, much to Gintoki's dismay. He uses Gintoki as an example to attract customers by claming a fight with him in front of everyone. He made Gintoki his partner as he calls him Coach Sakata in Lesson 404.
He came back to Earth after he claims that there was no opponents to fight. Later on Lesson 404 it was revealed that he contain a laser canon placed on his by the aliens. According to Gengai, he contains a interstellar beam canon that will active and fire when a league of planets line up. It would like earth declared war the whole galaxy.