Since their arrival in Brazil in 1908, the presence of Japanese immigrants has shaken Brazilian conceptions of race. Narratives of interracial marriages and biracial children in 1930s medical documents and short stories demonstrate the incorporation of the Japanese into Brazil and their subsequent marginalization within the Japanese community. This article compares and contrasts the shifting depictions of biracial Japanese-Brazilian children in Brazil by Brazilians and first generation Japanese immigrants in order to understand how their presence challenges and "negotiates" national identity. The process of othering and marginalizing biracial children upsets the hegemonic understandings of racial categorization in Brazil.