Himuro Gemma

Himuro Gemma is Jubei's arch nemesis, and has been even before being leader of the Devils of Kimon. It turns out that Gemma had betrayed Jubei and tricked Jubei's own clan into trying to kill him for being a traitor. In turn Jubei was forced to kill the Yamashiro clan in self defense, and then avenge their deaths by sending Gemma to hell.