Yoshimura is the elderly janitor of Kaimei High School. He often has a lot of work and sometimes asks the Sket Dan to help out.

At Kaimei High School, the Living Assistance Club (aka the Sket Brigade) was organized to help students with problems big or small. Most of the time, though, they hang out in their club room, bored, with only a few trivial problems floating in every once in a while. In spite of this, they still throw all their energy into solving these worries. 
(Source: Crunchyroll)

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Paulo Matos is a Brazilian actor and voice actor.

The hilarious misadventures of the "Sket Dan"; a couple of high schoolers who help out people as part of their club activity: Himeko, the hot-headed ex-delinquent with a soft spot for cute things and a taste for strange food; Switch, the brainy otaku who only talks via a computerized speech-application; and Bossun, the atypical leader of this looney bunch, with the amazing power to... concentrate very hard! 
Note: Won the 55th annual Shogakukan Manga Award in 2009 for best shounen manga.