Rin Itoshi.

Young man with short, somewhat messy green hair, blue-green eyes, long upper and lower eyelashes, white skin, quite tall at 1.87cm, slim but defined and somewhat muscular body

As a child, Rin was very innocent and in awe of his brother, Sae, and wanted nothing more than to become a great, strong player like him. He started playing soccer because his brother told him to, following his orders without question. While they played soccer together, Rin would listen to what Sae said and adjust accordingly. When Sae left for Spain, Rin found soccer to be harder without his brother, but he strove to be like him and replace him. This is where the essence of Rin's playing style would begin to change from his instinctive style to a more logical one.

Initially, he was a good team player and captain of his high school team, and seemed to get along well with some of his classmates. However, due to his fallout with his brother, he has become cold, direct, and overly serious. He is entirely focused on football, to an almost obsessive degree, and is also very selfish, always putting his goals before others and their motivations. Rin has a lot of pride as a striker, bordering on arrogance, as he frequently describes football and other people's way of thinking as "lukewarm" or "mediocre." These mannerisms and behaviors originated from his brother. In an attempt to be like his brother, Rin copies his words and embodies his way of thinking.

Rin seems to respect almost no one. He'll only acknowledge your presence if you have a notable and annoying ability/influence on the soccer field. He seems to have no friends, only rivals (only Isagi and Bachira apparently on general terms with him). During the match against the U-20s, he's more talkative with the team, giving instructions on the field and specifically talking to Isagi.

Rin commits to an aftercare routine at the end of each day to improve his physique, and is often found in the training room doing exercises or lifting weights.

Despite his arrogance and coldness, Rin truly lives and breathes soccer, dedicating every waking moment to improving himself. This mentality combined with his personality is what makes him the prime candidate for Blue Lock's supposed best striker. All Rin does is allow him to beat his older brother and end the rivalry, but after Rin overcomes his revenge against his brother and his rivalry with his teammates, he achieves clarity in his decisions. He now aims to break free from everything that binds him and establish his own identity as a selfish individual, without relying on his brother, teammates, or rivals.