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Su (stylized as SU; born 20 November 1973, in Tsujidō, Fujisawa, Kanagawa) is an MC for the hip hop unit Rip Slyme. His real name is Kazuto Otsuki (大槻 一人, Ōtsuki Kazuto). Su is also a member of Funky Grammar Unit. His former wife is singer-songwriter Ai Otsuka. He has one daughter, born on March 24, 2011.