The Uehara family dog.    ~!His previous owner was kind to him as a child, but as he grew up started to beat and abuse Ossan in order to deal with the frustration of being bullied at school. Due to this, Ossan ran away and was later found by Koichi. !~

Kouichi Uehara is a fourth grade student living in the suburb of Tokyo. One day, he picks up a large stone which turns out to be a fossil of a baby "Kappa" sleeping underground for the past 300 years, and names it "Coo". Koichi and Coo become good friends and starts living with his family. However, Coo could not adjust to the life style in Tokyo and starts to miss his family. On a hot summer day, Koichi and Coo decide to go on an adventurous road trip to find his peers. <br><br>
(Source: AniDB) 

He is a member of Theatre Echo, a theatre troupe and talent management firm known for its comedy sketches.