Inuyama (マウンテンドッグ, Mountain Dog), fan nicknamed "Firefly Samurai" is the assassin hired by Sasaki Ryujiro that tried to assassinate Jin.


Inuyama is a semi-old man with a wrinkly face and brown hair with a medium length pony tail in the back. He wears a blue kimono that reveals his chest, and he wears his sword on his left side.


The Unnamed Assassin has a coolheaded personality and is a very nice man. He said "For me killing is merely just a business, it's nothing personal."

He likes to have fun but is also very wise. He stated Jin might be able beat him if they were in a dojo.