Nationality Argentinian
Date of birth 25 January (3109 days full record Data Book)
1 January (3109 days full record Data Book)
Height Weight Blood type O (3109 days full record Data Book)
AB (Complete special issue) Dominant leg Right (3109 days full record Data Book)
Nicknames

ボカ ジュニアーズ - BOCA JUNIORS (U14).
ボカ ジュニアーズ - BOCA JUNIORS (n°10, captain).
ナポリ - NAPOLI.

アルゼンチン - ARGENTINA (U16) as an under 16 midfielder (n°10, captain).
アルゼンチン - ARGENTINA (U20) as an under 20 midfielder (n°10).
アルゼンチン - ARGENTINA (Olympic) as an under 23 midfielder (n°10, captain).

世界選抜 - WORLD SELECTION as a midfielder (n°21).
アルゼンチン - ARGENTINA as a midfielder (n°10).

Check his appearances even before.

Check his appearances before J Boys challenge.

Check his appearances in J Boys challenge.

Check his appearances in World youth.

Check his detailed playstyle in J Boys challenge.

Check his detailed playstyle in Rising sun.

Takahashi confirmed in an interview that Diego Maradona is the inspiration behind Juan Diaz. His name might come from Ramón Díaz, who played the '82 World cup which influenced Takahashi a lot for the J Boys challenge arc.

Captain Tsubasa was vague about his club, then the Data book says that his club was Argentinos juniors, but Rising sun stated that it was Boca juniors. Unless there was a transfer, he always played for that team, even in the u14 section. Even a transfer would be unlikely since Barbas wanted to recruit Tsubasa in the Argentinos juniors and Diaz stated that they would be rivals in Argentina (Captain Tsubasa arc, chapter 99, page 23).