Kojiro Nanjo, known as Joe in the skating world, is a prominent character in the anime series 'SK8 the Infinity.' Joe is a charismatic and skilled downhill skater known for his immense strength and agility. He co-owns an Italian restaurant and is best friends with Cherry Blossom, another top skater in the series. Joe's skating style is powerful and aggressive, often using his strength to overpower opponents. He serves as a mentor and older brother figure to the main characters, Reki and Langa, guiding them through their skating journey.