The sixth and youngest son. He is very carefree and dislikes baths. His catchphrase is Todo no tsumari (とどのつまり ...in the end?). In "Osomatsu-kun Grows Up" he runs a fish market. His name comes from todomatsu (椴松?), another name for the momi fir of Japan.
In Osomatsu-san, he is effeminate and is far more successful with women than Karamatsu.