Dr. Shinichiro Harai (原井 晋一朗 Harai Shin'ichirō), also known as Shin, is the godfather of Hiro and Tadashi Hamada, and ex-boyfriend of Cass Hamada. He is a retired crime fighter, formerly under the alias Bushido.
Shin is a man of Japanese descent in his late thirties to early forties. He has a slim built with sharp features, short black hair and brown eyes. He has a small scar across his left eyebrow.
He wears a grey-blue collared t-shirt, tan pants, green trainers and a dark brown duffle coat. At work, he wears light green scrubs.
Shin is a mild-mannered and friendly man who is slow to anger. However, he has strong sense of honour, even when it causes him grief. Believing himself guilty for the deaths of Tom and Manami caused him to distance himself from the remaining Hamada family members.
Shin's parents were members of The Founders, a faction consisting of respected families descended from the twelve men and women who presided over the creation of San Fransokyo. Shin, however, has little interest in this world of traditions and old money, choosing instead to go to university and study medicine. Due to a typo in the students' surnames, Shin roomed in the same dorm with electronic engineering major Tom Hamada, who quickly became Shin's best friend. During this time, Shin also met Tom's younger stepsister Cass, who he immediately developed an attraction to.
While still in university, Shin learned that his family intended to arrange a marriage between himself and Manami Takashino, another of legacy of The Founders. Though Shin and Manami got along well, neither of them had the desire to wed.
- Bushido's design and powers were inspired by Marvel comics' antihero, the Silver Samurai.
- Shin's full name, Shinichiro Harai, was based from the Silver Samurai's civilian identity, Keniuchio Harada.
- In Big Hero 6: Spell of the Siren, Cass claims to have once dated a medical student, referring to Shin.
- Shin is a baseball fan and a follower of the San Fransokyo Ninjas.