Oliver Aiku

Aiku is a very tall, muscular young man with dark, shaggy purple hair with lime green tips and short facial hair. As a child, his facial structure remained the same, only becoming sharper and more refined as he grew facial hair. Aiku is heterochromatic, and his eyes are different colors, with his left eye being green and his right eye being purple. However, in the anime, his right eye's color was changed to blue.

During the Japan National Representative match, Aiku wears the official white with red trim of the U-20 team jersey and shorts and wears the captain's armband on his left sleeve. Underneath this, he wears a black shirt and gloves. Aiku also wears black cleats with red trim.

When Aiku was a child, he wanted to become the best striker in the world, but his coach and other adults tarnished his dream with their philosophy of “playing for others.” He lost the will to become the best striker in the world over time, but he wholeheartedly decided to become the best defender in the world to defy all the adults and coaches who told him to play for others and refused to help him pursue his own goals. He promised himself, however, that if a “real striker” came along, struggling to flourish in Japan, he would do whatever it took to make them shine and prevent them from being tarnished like he was.

Aiku has been shown to be a womanizer when he invited two girls to karaoke on a date when they didn't know each other. They slapped him and left because of his rudeness, assuming they would want to share him, but he doesn't seem to be too concerned with women.