Question: why is oikawa in brazil?
Answer: There are a lot of reasons Oikawa might be in Brazil. Oikawa popping up at this point in time actually makes a lot of sense; if you're going to bring back a character outside of Karasuno, Oikawa is the one. He spurred so much growth for both Hinata and Kageyama, who were so determined to beat him for so long.