Takashi is a very loving and hard-working man. Even though his market and functionary named Samejima go through financial problems, he still manages to function as a normal father. Since he's not as serious as his wife or his children, he's more expressive and involved with his kids' lives. He's also not as smart as Shizuku, but he is able to pick up on little signs in his daughter.

Because Yoshino has called him useless and a fool so many times, he jokingly accepts that he is useless and foolish. It's never stated if he agrees to this because he knows his wife loves him deep down or because he's used to it by now.

(Source: tonari-no-kaibutsukun.wikia.com)