this came to me in a dream
Juzo is originally from Haiti but picked up a more "Japanese Sounding" name to avoid discrimination when he started Hope's Peak, originally being called Calixte Mathurin. "Juzo Sakakura" was literally just a stagename at first because boxing announcers couldn't say his real name,but over time he sorta just learnt(?) to go by it in his day-by-day,to the point where even Chisa and Kyosuke didn't realize.But if you were to look closely,you'd see that he has a LOT of ethnic features,most notably almond-shaped eyes and high cheekbones.
~he also definitely tried bleaching his skin at one point and just.failed.hence the kinda dull-tan tone.he also had his hair in locs before he was scouted.but ended up changing it to straight.~
In conclusion:Juzo Sakakura buried literally all of his heritage to progress in the 2010's world of sports,especially in Japan,to the point of changing his name and altering his physical appearance to fit into standards.
All fine until the killing game,since Juzo never LEGALLY changed his name,so there's an absolute panic as the name "Juzo Sakakura" appears on no files...then they see a recorrd FOR Calixte Mathurin and realize his information matches Juzo perfectly,so "hilarity" ensues.