Kousaka Yoshikage

Profile
In Sengoku Rance, there are 3 optional, colorless events in Owari to learn more about the relationship between Inukai, Suzume, and Kousaka Yoshikage.

It is implied Yoshikage is the father of Inukai, or at the very least took care of Inukai when he was younger.

Most probable reference goes to Kousaka Masanobu.