Susumu is a large muscular man with light skin. He has long black slicked back hair with a moustache and goatee.
He wears a white aikidogi with a black hakama.
Susumu is very overprotective of his daughter Sunao, worrying that she will be injured in her sparring sessions with her mother and wanting to prevent Kazuya from forming any sort of relationship with her. His wife Suzuri is shown to be the dominant one in their relationship.
Susumu was considered the weakest man in the Sumeragi dojo, having not improved throughout the two years he had been there and was ridiculed by the other students. One day another student had him swap chores, leaving Susumu cleaning the bathrooms without training. Suzuri walked into the washroom naked while he was still cleaning. Suzuri prepared to hit Susumu but the two of them slipped, resulting in Susumu accidentally hitting her with broom. It had been the first time someone besides her father had landed a hit on Suzuri, so Suzuri had Susumu take responsibility and marry her. Susumu would be forced to undergo special training to make him a husband fit for Suzuri and they would get married six years later.
He made his first appearance when Suzuri knocked Sunao out of the dojo during a sparring match and tried to comfort her.
Later when Kazuya was invited to the Sumeragi home, all of his senses stopped him from getting closer as it was shown that Susumu was waiting in the front door as he prepared to strike Kazuya, until Suzuri appeared and beated him up, causing Kazuya senses to be free from the danger, and upon entering he sees a large splatter of blood on the floor, meaning it was from Susumu. Then as Kazuya and Sunao are force to take a bath with each other, Susumu was hiding in the water. As he prepared to strike Kazuya in his family jewels, he saw a foot in the water, causing Susumu to release a powerful strike, but unfortunately instead of attacking Kazuya he attacked Sunao instead.
That night as Kazuya and Sunao are now forced to perform in bed in their birthday suits, Susumu bursted in once again, preparing to strike Kazuya with another move ten times more powerful than the last and once again, striked Sunao (thinking Kazuya was on top) and apologized for what he did and tried to do it again, only to be attacked by his wife and freak out upon hearing that Kazuya and Sunao has finished with a blood mark on the bed.
- Susumu's surname Sumeragi means "emperor" (皇).