Shoichiro Nishikado (西門 祥一郎,Nishikado Shōichirō) was the eldest son of the sixteenth generation of the Nishikado family. He became a doctor, leaving the tea school for his brother, Sojiro to inherit.
Shoichiro was born as first son of his mother and father in the sixteenth generation of the Nishikado family. His two younger brothers were born sometime after. As the eldest son, he was going to inherit the Nishikado style of tea ceremony. However, Shoichiro was unable to handle the pressure, and left the family to become a doctor. His brother Sojiro Nishikado later inherited the family's tea school.
In Meteor Rain, Xi Men describes him as "easy going" and that he ran away because of the family's "hypocrisy".
Shoichiro is mentioned in episode seven of Hana Yori Dango Returns. In the drama, Sojiro believes that Sara Hinata was in love with Shoichiro, after seeing her so upset when he left the family. She also refers to him as "Sho-chan". Like in the manga, Sojiro no longer keeps in touch with his brother.