This article is for the manga version of Koutarou Tamaga. For their anime counterpart, see Koutarou Tamaga.
Koutarou Tamaga (Japanese: 玉賀 光太郎（タマガ コウタロウ）, Tamaga Koutarou) is a character appearing in the manga series, Crash B-Daman by Tomoya Kuratani.
Koutarou is an independent B-Daman scientist who raised Hitto as his own son. In reality, he is Hitto's foster father and uncle. Koutarou is also Tycoon Shou's brother-in-law who rescued Hitto from the boy's deranged father.