Ryou Saruyama
First Appearance: Dumbing of Age 13 September 2010
Relatives: Haruka Saruyama (wife), Dina Saruyama (daughter)
Ryou Saruyama is Dina's father in the Dumbing of Age continuity. Like all members of the Saruyama family, he's notable for his extremely quiet nature and omnipresent hat.

Dina's parents first showed up during freshman move-in day to help her get settled in; and were briefly seen again during the Freshmen Family Weekend arc. At one point, Sarah Clinton expressed an only-half-joking interest in being adopted by them.