He is known as the "Cord-Cutting Shinogi" (紐切り鎬, Himokiri Shinogi).
At the beginning of the series, Kosho is shown to be strong but overconfident due to his cord cutting style making everyone fear him. Due to his first loss by the hands of Baki Hanma he starts to become more humble. Because of that; he and Baki became good friends and rivals.
It is shown in the match between him and his older brother Kureha. Kosho feels overshadowed by his older brother for always watching over him making Kosho appear weak to others and always needing protection from his older sibling, during the match Kosho begins to have a nervous breakdown and reverts back to when he was a child and begins to cry and fear of his older brother opting Kureha to feel compassion for his younger brother and forfeits the match. Kosho loves and loathes his older brother Kureha for overshadowing him his entire life over time the brothers grew to share each others love for one another's as equals.
Shinogi Kosho is a lean slightly muscular average height man his exact age is unknown but appears to be in his early 20's. In the anime he has long brown wavy hair with a purple tint. He sports a dark purple/violet colored Karate gi uniform with black belt and the sleeves rolled up. In the Baki OVA special Kosho's color scheme is completely different. Instead of brown hair he sports bright red hair and Karate gi.
In the New Grappler Baki series, Kosho faces off against Doyle and is blasted by a bomb strapped to Doyle's chest severely burning Kosho's body only to be healed up by his older brother.
He fights using a technique called cord cutting which involves cutting your opponents nerves so they can't move. Shinogi is a strong fighter who could fight Baki during the Champion Saga. Kosho's strongest weapon are his fingers. After his training, Shinogi's fingers were so strong he could tear flesh and break wood easily. His fingers are also so strong that he could use them to easily kill bulls who can weight around 1100 to 2200 pounds and with ease, destroy basketballs with them. Doppo Orochi compared fighting him barehanded to fighting a tiger.
- His appearance is probably based on visual kei rocker named Yoshiki.
- His fighting style and techniques may possibly be based on Uechi-Ryu Karate.