Soujirou is the father of the Marui sisters in the Mitsudomoe franchise.
He is a very large and obese man who is protective of his daughters and will go to any length to protect them. Unfortunately, he looks nothing like his daughters and due to his size he is often thought to be a pedophile when seen with them or near their school.
Sojiro is a character in both Mitsudomoe anime series, Mitsudomoe and Mitsudomoe Zoryochu!, published by Aniplex with animation production by Bridge and the manga series Mitsudomoe, published by Akita Shoten and serialized in Weekly Shonen Champion. Sojirou's original design is credited to manga writer and illustrator Norio Sakurai while his anime version is credited to Takaharu Okuma. Sojiro makes his first anime appearance in Mitsudome episode 3, "So Many Sinners".