Nishinoya Yuu –> Half Japanese / Half Korean - His mother is Korean from JeonJu. Noya’s dad was traveling Korea when he met his wife. And she was a farmers daughter. His father was a hitch hiker and he worked on the farm for some time and fell in love with her. So he moved back to Japan with her and got a stable job. Then had a kid in Sendai.
Tanaka Ryuunosuke –> American born full Japanese. Born in San Francisco, CA. When he was born, his mother sent him and Saeko to live with his grandmother in Sendai so they grew up in Sendai.
Ennoshita Chikara –> An old regal family settled in Kyoto (Father) and Mother is Korean from Busan
Hinata Shouyou –> Father is Japanese born in Ireland and Mother is Irish descendant from British Isles.
Kageyama Tobio –> Father is Japanese/Korean and Mother is Taiwanese.
Tsukishima Kei –> Lithuanian adopted into Japan.
Yamaguchi Tadashi –> New Zealand mother and Japanese father
Tetsurou Kuroo –> Indonesian mother and Japanese/Taiwanese father. Kuroo was born in Indonesia then moved to Tokyo at the age of 2.
Oikawa Toru –> Korean Father and Japanese mother. He was born in Korea under the name (Kang TaeJun) with his Older brother (Kang MinGuk) then his mother, older sister and him left their father behind to move back to her home city of Saitama where she temporarily kept the two kids to processed their immigration papers under her maiden name of Oikawa. Then she moved in with her Aunt (Emiko Okuyama) the Mayor of Sendai.