Juan Diaz is the captain and leading scorer on the Argentine soccer team. Initially, he comes across as arrogant and boastful, but after facing Japan and engaging in a heated match with Tsubasa Ozora, his demeanor becomes more humble. Despite this, Diaz possesses exceptional talent and has been hailed as the next big thing in Argentine soccer, earning comparisons to Diego Maradona. As a result of their shared skills and similarities, he and Tsubasa have developed a fierce rivalry. Juan's name is derived from Ramón Ángel Díaz, but his character closely resembles that of Diego Armando Maradona.