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.
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 leaving the school and left Otae and Shinpachi to carry the burdens.
- Shimura Shinpachi:He views Shinpachi as a student and his little brother as much of calling him Shin Boy.
- Shimura Tae: He views Otae as a student and a sister as much as helping her and her brother to fix their Dojo. He also unaware of being otae's first love and thinking of Gintoki being otae's boyfriend.
- Sakata Gintoki: He views Gintoki as a student and member of the saber style as much of Gintoki's dismay. He also thought of using Gintoki as example to attract costumer by claming a fight with him in front of everyone. He made Gintoki become his partner as referring 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.