Oliver Aiku is a key character in the anime and manga series Blue Lock. As the captain of the Japan U-20 national team, Aiku is renowned for his exceptional defensive skills, tactical intelligence, and leadership on the field. He plays as a center-back and poses a significant challenge to the Blue Lock strikers during the intense Japan U-20 vs. Blue Lock Eleven match, serving as both a rival and a benchmark for the protagonists’ growth.