Nanjiro Echizen is a fictional character from the popular manga and anime series Prince of Tennis. He is the father of the main protagonist, Ryoma Echizen, and a former tennis player who was known for his exceptional skills and achievements in the sport. In the series, Nanjiro is portrayed as a laid-back and carefree individual, often seen reminiscing about his tennis career. Despite his relaxed demeanor, he serves as an important mentor to Ryoma, encouraging him to pursue his passion for tennis and develop his own unique style.