Satoshi Houjou

Satoshi is the older brother of Satoko Houjou. Although he is currently missing his past influence is the key to the actions of several characters in Higurashi. Similar to Satoko he cannot distinguish the difference between cauliflower and broccoli. Because of this it can be inferred that both Satoshi and Satoko are colorblind. Satoshi is referred to by Satoko as NiiNii a childish form of the Japanese word ani ani meaning older brother. from Wikipedia