In Non Non Biyori, Koshigaya Suguru is the older brother of Komari and Natsumi. Most sources note that he has essentially no presence and very little speaking in the series. This is played for humorous effect a number of times.
I'm wondering if he even has any spoken lines or voice acting in the anime. If so, who is his voice actor? Most sources (e.g. Wikipedia) don't list a voice actor at all, but also don't explicitly say that he is totally unvoiced.