He is noted for his roles in Return of Ultraman,[2] Eyeful Daisakusen, Uchuu Keiji Gavan, Ninpu Sentai Hurricanger, G-Men '75, and Shin Kyoto Meikyū Annai.

His guest roles have included multiple episodes of Key Hunter, Mito Kōmon, Taiyō ni Hoero!, Zenigata Heiji, and Abarenbō Shōgun.

He appeared as Asano Daigaku, younger brother of the daimyō whose forced seppuku triggered the events of the Forty-seven rōnin, in The Fall of Ako Castle.

A modern role was in the 1986 Kei Kumai film adaptation Umi to Doku of the Shūsaku Endō novel of the same name (translated as The Sea and Poison).

In anime, Ken provided the Japanese voice of Kazundo Gouda in Ghost in the Shell: S.A.C.