Kyōsuke is a handsome man with shoulder-length dirty gray hair, golden-brown eyes (as seen from Chapter 26.5 Pg. 1 in color) and he normally puts on a tired look.
According to Kyouko Hori, Kyousuke is a rude, selfish and forceful man who jokes around on serious topics and has a knack to leave for long periods of time. He is also cheap, as when he was asked by his family to eat Beluga Caviar or Sharks's Fin Soup, he flatly denied them. He seems to be able to shift between moods quickly, as when he was sleeping before being visited by Izumi Miyamura, at the sight of him Kyousuke's tired demeanor changed to a happy one instantly.
Yuriko is Kyōsuke's wife whom he met in high school.
Kyouko is Kyōsuke's daughter who acts cold towards him and she doesn't mind physically hurting her father as she performs an axe kick on him when Kyousuke tried to act cool in front of Izumi Miyamura. Later on, when Kyousuke asks Hori to prepare him some food, she comes back with a bowl of soup and purposely jams it into the back of his head. He then apologized to Miyamura for Hori's "crazy domestic violence habits".
Souta is Kysokue's son. Although their relationship isn't shown much in the manga, Souta and Kyousuke have a good relationship. They both seem to have similar personalities, both are chipper and love when Miyamura comes over. They also tend to agree on what they want to eat. Kyousuke's relationship with his son is much healthier than his relationship with Hori.
When Kysokue first met Miyamura, he intimidated him, but he soon become fond of him as Kyousuke finds Miyamura interesting and accepts him into the family quickly. He sees Miyamura as his future son-in-law and trusts that he'll take good care of Hori, but Kyousuke tends to ask him random questions which usually pertain to Hori.
- Kyōsuke is first seen smoking whenever he is coming home.