Kansuke Yamamoto was a subordinate of Takeda Shingen.
Kacchu no Senshi Gamu
He's blinded on one eye and uses a staff to support his leg. His main function is being a messenger between Gama and his allies. After a visit at Shingen Takeda's base, he returns to Gama to give the order to kill all the ganins of Kagero.
Here he meets general Hayabusa who greets him as he enters Gama's area. He leads him on the way. After Kansuke has told the news to Gama, Hayabusa enters and uncovers that Gama is not a human warlord, but a ganin.
Kansuke is killed by Gamu’s ganins when he's on his way back to Shingen Takeda.