Koshou Shinogi - is the younger brother of Kureha Shinogi. He is a strong and skilful fighter in ‘himo-kiri’ (cord-cut) style Karate, his speciality being cord cutting where he severs the nerves of the opponent to impair their vision or body parts.
Koshou 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 Koshou's color scheme is completely different. Instead of brown hair he sports bright red hair and Karate gi.
In the New Baki Search for our Strongest Hero series Koshou faces off against Doyle and is blasted by a bomb strapped to Doyle's chest severely burning Koshou's body only to be healed up by his older brother.
At the beginning of the series Koshou 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.
It is shown in the match between him and his older brother Kureha; Koshou feels overshadowed by the older brother for always watching over him making Koshou appear weak to others and always needing protection from his older siblings at the end of the match Koshou 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.
Kureha Shinogi - Koshou 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.