Nakamura Kyoujirou was a stray dog picked up by the leader of the Mashiroi yakuza group. Believed to be the villain in the story but in fact has a very kind heart.   In episodes 107-108

Life isn't easy in feudal Japan... especially since the aliens landed and conquered everything! Oh sure, the new health care is great, but the public ban on the use of swords has left a lot of defeated samurai with a difficult decision to make concerning their future career paths! This is especially true if, as in the case of Gintoki Sakata, they're not particularly inclined towards holding a day job, which is why Gintoki's opted for the freelance route, taking any job that's offered to him as long as the financial remuneration sounds right. Unfortunately, in a brave new world filled with stray bug-eyed monsters, upwardly mobile Yakuza and overly ambitious E.T. entrepreneurs, those jobs usually don't pay as well as they should for the pain, suffering and indignities endured!<br><br>
(Source: Sentai Filmworks)

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Masaya Matsukaze is a Japanese actor, voice actor and radio personality. He was formerly affiliated with Big Apple, Radix Mobanimation Multicye Division and Varoque Works, and is currently affiliated with Aoni Production. He was born in Fukushima Prefecture and is now living in Tokyo. He is married to Emika Umemoto (ex-dental assistant) since August 2003.

Dario Sansalone is an Italian voice actor. 

Kyoujirou Nakamura