Rin

Gender Male Age 16 Birthday September 9[2] Height 115 cm (kid) 187 cm[3] (6'2")

Blood Type A[2] Hair Color Dark Green Eye Color Turquoise Relatives Itoshi family Sae Itoshi (Older Brother) Unnamed father Unnamed mother Rin is a first-year high school student who has played as a forward his entire life. He is the younger brother of Sae Itoshi and he himself is emerging as one of the most promising talents in the football world. Rin's main goal is to become the world's best striker.

Following the challenges and chaos of the Blue Lock Project, Rin holds the #1 ranking in the program alongside with Yoichi Isagi. Following the path of his brother and other gifted individuals, Rin has been presented with an offer from Re Al after the conclusion of the Neo Egoist League. Following the end of the Neo Egoist League, Rin has qualified to become one of the 23 players for the new Japan U-20 entering into the upcoming PIFA U-20 World Cup. Rin is a tall teenager with a slim but muscular build. He is noticeably taller than Yoichi Isagi who is 5 months older than him. He has dark green hair with a bang going across his face more in his right eye, slim teal eyes, and distinct eyelashes that he shares with his brother Sae Itoshi. As a young boy, Rin looks largely the same, his facial features just become more distinct as he gets older.

At Blue Lock, Rin wears the standard issued body suit (black with gray stripes) and tracksuit. During Second Selection, he wore Team Red's #1 jersey and wore Team A's #1 black jersey during the Third Selection. Only once the Japan U-20 match begins does he don an official blue Blue Lock player uniform with the jersey #10 and a captain's armband. During U-20 World Cup, Rin wears the Japan U-20 uniform, loosing the captain armband.

During Neo Egoist League, Rin wears the Paris X Gen uniform with long sleeves. As a child, Rin was quite naïve and admired his brother, Sae, desiring nothing more than to be a strong and impressive player like him. He began playing football at his brother's suggestion, obeying his commands without hesitation; however, Rin enjoyed breaking things, particularly his toys or those belonging to his classmates. While watching a superhero film, he was less interested in the primary hero and more fascinated by the final antagonist, believing that battling a more powerful foe and ultimately being defeated was impressive. He conveyed his wish to fight formidable foes, defeat them, and perish. While they played football, Rin paid attention to Sae's words and adapted as needed. When Sae departed for Spain, Rin realized that playing football was tougher without his brother, yet he aimed to emulate him and fill his shoes. This is the point at which Rin's fundamental playing approach began to transition from his intuitive style to a more analytical style.

At first, he was an excellent team player and leader for his middle school squad, seeming to have a friendly relationship with several of his teammates. Nevertheless, because of his conflict with his brother, he has turned distant, curt, and excessively serious. He is completely absorbed in soccer, to a nearly obsessive extent, and is quite self-centered, as he consistently prioritizes his ambitions over the aspirations of others. Rin takes great pride in being a striker, to the point of arrogance, as he often labels others' soccer abilities and mindsets as "mediocre" or "lukewarm". These mannerisms and actions originate from his brother; in trying to imitate him, Rin mirrors his speech and adopts his mentality.

Rin appears to have little respect for anyone. He will only recognize players who possess a prominent skill or impact on the field. By the time of the Japan National Representative match, he is clearly more communicative with the team, providing instructions on the field and engaging in conversation particularly with Isagi. By the conclusion of the Neo Egoist League, Rin has ultimately discovered a player he admires, apart from his sibling.

Rin dedicates himself to a daily aftercare routine to enhance his physique, and he is frequently spotted in the training room performing drills or lifting weights. In spite of his arrogance and detachment, Rin genuinely embodies soccer, committing all his waking hours to improving himself. Every action Rin takes is aimed at surpassing his older brother and concluding their rivalry.

He says he doesn't cry. His favorite food is ochazuke, especially ochazuke with bream. His favorite manga are Dragon Head and Ciguatera. His favorite animal is the owl. His favorite movie is "The Shining". His favorite song is Prayer X. The first thing he washes when in the bath is his eyes. He is unfriendly or blunt. He is fluent in English. He spends his holiday either by playing horror video games or immersing himself in horror movies. He is not good at calligraphy. If it were his last day on Earth, he would fight with his brother. He doesn't remember how many Valentine chocolates he got last year because he declined all of them and gave them back. His morning routine consists of opening the window to let in fresh air, taking a deep breath, stretching, morning yoga, meditation, revisiting his feelings of sadness and rage, and finally starting his day.[31] When Rin asked what he does for luck before a showdown, he said, "Think about beating nii-chan [Sae]. I can't lose to all of the other small fry".[31] If you had to take one person to a desert island, who would it be? "My brother Sae, I guess. Hmph. Just so I could take out all my pent-up frustration on him. Ah—but I wouldn’t know what to talk about… Damn… Actually, I’d choose Isagi… Ah, but living with just the two of us would be boring. Whatever, anyone would do. As long as it’s not those two. Like an android or something."