He and his group attacked Team Minato during the Third Great Shinobi War after they broke into Iwagakure territory. Congratulating the young shinobi for achieving this feat, he then attacked Kakashi. He was however presumably killed after Minatoteleported to his team's side after being alerted that the kunai he gave Kakashi was thrown.
Sumashi had a short crop of black hair, small dark eyes and thick eyebrows. He wore the standard attire of the Iwagakure shinobi complete with a forehead protector which he wore like a bandanna, flak jacket, and the single left-sleeved shirt with a lapel running down the right side of his waist and sandals.