shota matsuda (+ his brother ryuhei) is quarter zainichi, not half, from his grandmother of the father's side
idk what the point of your obsession but some that i remember:
Mitsushima's sibling - quarter french
tadanobu asano - quarter American, with european decent
erika sawajiri - half algerian
anna tsuchiya - half american, european descent
reina trendl - half german
saito asuka (of nogizaka46) - half burmese
becky (tv personality) - half english
rola (tv personality) - half bangladeshi
kiko mizuhara - more like half american, half zainichi korean -count by ethnicity-
kaela kimura (singer) - half english
elaiza ikeda - half filipino
takeshi kaneshiro - half taiwan