Kousuke is a tall, slender man with dark eyes and dark hair that is unkempt like his sons. He is considered to be very handsome and often has a flushed face when he gets emotional.
Kousuke is a very emotional and fearful person and is very worried about being loved by his sons and his wife and works his hardest to keep from disappointing them, shown when he went through the trouble of preventing his sons from watching his show as he didn't want to upset them for playing the antagonist of the series. However, Kousuke always tries to make time for his family and loves his wife and children dearly.
Unlike his wife, Umi, he is easily stressed and upset, always being very affected by the opinions his children have of him. His emotional personality is passed onto his son, Kazuma, while his wife Umi's more cheerful personality is passed onto their son, Takuma.
Kousuke is a up and coming famous actor, starring in countless movies, commercials and television shows. His most notable work, however, is his depiction of the character, Boido in the Justice Knight television series that the daycare room children are big fans of.
Although it is not clear how or when Umi and Kousuke first got together, it can be hinted that Kousuke confessed his feelings to Umi while attending high school with the support of his friend, former classmate and agent, Kokubo.
He first appears at Morinomiya, standing in some bushes when he picks up his son. He is mistaken as a pervert by Ryuuichi and Kamitani, causing Kamitani to knock him out with one of his P.E. shoes, before Takuma figures out who he is—to be confirmed by Usaida, who could not recognise him with a mask and sunglasses on.