Jimon is a minor character and is one of the first to reveal Demon Eyes Kyo. Kyo shamed him at the Battle of Sekigahara by not killing him and by looking down on him like he was worthless trash.

In manga:

He took a job as a yojimbo to a local Daikan and killed 107 people to perfect his technique and be ready to face Kyo again to regain his honor. He is a master of Hien Ken, a move that allows him to draw his sword and strike three times in the blink of an eye. Kyo challenged him to a drawing match, although Kyo's sword was almost twice as long and had no sheath. Kyo allowed Jimon to draw first, then easily kills Jimon by cutting him almost in half.

In anime:

After Battle of Sekigahara he was a wandering samurai who sought revenge on Kyo for shaming him. He became a snake-like kenyou when he finally found Kyo.