Rin Itoshi

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.

His birthday is on September 9th. He is 28 years old. 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.[30] 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".[30] Rin ranked 6th in the first popularity poll with 1,028 votes. Rin's English voice actress for when he was a child, Lisette Monique Diaz, also voices Oliver Aiku when he was a child and Tenka Naruhaya. By the end of the Neo Egoist League, Rin got a ¥240,000,000 offer from "Re Al" (レ・アール Re Āru?) [31]. Re Al is based on Real Madrid CF. After his awakening in the PXG vs Bastard München match[32], Rin or the concept of his destroyer flow are frequently called by the epithet 「破壊獣」 (hakaijū), a portmanteau of the words 「破壊者」 (hakaisha, destroyer) and 「壊獣」 (kaiju, monster)[33][34][35][36]. This is inspired by the fact a kaiju from a children's TV show was what initially inspired Rin to discover his 'life-risking destruction' ego, and the memory he recalled during the match to tap into it.[32] It's symbolic of the evolution of his ego; he isn't just a 'destroyer' anymore, but one that fights to the death against the strongest opponents like a monster. Rin has the longest unbeaten streak among all the Blue Lock Project players, being that he hadn't lose a single game from the start of the project until the game between Bastard München and Paris X Gen (this is excluding the game against Team World Five where the Blue Lockers were meant to lose).

Rin is a tall teenager with a height of 187 cm, or 6'2 and 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 than left 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.

Sae Itoshi

Since a young age, Sae has been cold, blunt, and serious. He has only ever cared about becoming the best Midfielder in the world and has only had time for things that get him closer to his goal. Sae can also be arrogant and condescending, looking down on others even if they are older than him and wield organizational authority. He is egotistical in his football play but has shown to be able to restrain himself and play his position, not trying to outshine others unnecessarily.

Sae is prideful as a football player, looking down on Japanese football and all who participate in it. Sae states that he would much rather die or play in Europe with a bunch of college students than play in the J-League or play on the Japan National Team. He is very confident in his skills and wholeheartedly believes that nobody in Japan is worthy of his skills as a teammate. He dislikes the fact that he was born in Japan, saying things like he was simply born in the wrong country.

Though Sae is a difficult person, he is not impossible to work with. He, out of pure interest, decides to stay in Japan on a whim after hearing about the Blue Lock Project and even joins the Japan U-20 for the match against the Blue Lock Eleven. But when his interest is satisfied, he has no problem abandoning those he deems unworthy of his time.

Despite Sae's arrogance, he does not mind staying in his role as a midfielder and key passer. During the Japan National Representative match, Sae gave the Japan U-20 forwards every opportunity to score, and only after repeated failures did he decide to score himself. After the game between Japan U-20 and Blue Lock Eleven, Sae is not above admitting when he is wrong, as he tells Rin that he was wrong about Japan; they are capable of creating good strikers and that their football can still change.

During their childhood, Sae is shown to be much friendlier, more caring and loving towards his brother Rin. He even took responsibility for Rin destroying his toys. Sae showed concerned when Rin said he wanted to fight a stronger opponent, destroy them and die.

Sae is his genius and just as arrogant older brother. Sae is regarded as a genius and monster in the professional world despite being a few years older than him. They used to be quite close with each other in their childhood. Sae was admired by Rin and he was the reason Rin started to play football. Sae and Rin used to play together and won many games together, they even made a promise to become the two best strikers in the world. However, they got separated when Sae was scouted to play in the inferiors of the Real Madrid. Four years later, Sae and Rin met again while the last one was training late. Sae then tells him that he will become the best midfielder instead of the best striker of the world, thing that greatly affected Rin since his reason to play football had been his older brother. Sae then challenges Rin to play a 1vs1 and tells him that if he defeats him he will retake that dream with Rin. Sae utterly defeats Rin and says he feels disgusted with him and the football of Japan, also telling Rin to never use him as a reason to play football ever again, leaving his younger brother behind while he stays in the field shocked and later at his home swears to destroy Sae.

As a result, Rin became highly and sometimes scarily motivated to defeat his brother in football. He claims that they are not on bad terms but the mere thought and mention of Sae seems to highly upset the usually calm and collected Rin. They haven't seen each other in years, not till the match between Japan U-20 and Blue Lock Eleven. Sae is absolutely indifferent to Rin and doesn't speak to him until they have a 1vs1 in which Sae tells him that he will never be able to defeat him as long as he keeps considering himself as "Sae Itoshi's younger brother". And while Rin tries his best to prove that he is better than his brother, Sae doesn't pay him attention. Even after finally besting him in a 1vs1 match, their relationship fell virtually beyond repair when Sae acknowledged Rin's teammate and rival, Yoichi Isagi's skills instead of his own.

Despite all that however, Rin was shocked when he learned that Sae was gonna play for the Japan U-20 in the PIFA U-20 World Cup, although unaware of the latter's real objective.

Yoichi Isagi

Isagi is a teenager of height 5'9 or 175 cm and slim build, developing a stronger, more defined-looking physique. He has short, dark blue hair that leaves a V-shaped fringe between his deep blue eyes, along with a plant shaped ahoge at the top of his head.

Isagi is easygoing and has a generally friendly, cheery personality, but his simple and innocent habits often get on the nerves of the people around him. He tends to avoid any childish squabbles among other Blue Lock competitors and tries to be a peacekeeper between his friends and rivals. At the beginning of Blue Lock, Isagi is massively unsure of himself and his skill due to being the second-lowest-ranked player in Blue Lock initially and his conflicting ideas of football. As time goes on, Isagi develops a more assertive presence on and off the field, becoming the foundation for Team Z and garnering the respect of some of the best players in Blue Lock, who mostly have heavily assertive or dominant personalities. As of Third Selection, Isagi has the confidence, charisma, and reputation to talk openly with Rin Itoshi, one of the most talented yet difficult people in the Blue Lock Project.

Isagi claims that Rin is his rival and the person he wants to surpass. Rin stated that Isagi is nothing to him, although it is implied that they're at least competitive. Following Blue Lock's victory against U-20 Japan, achieved by Isagi, Rin developed a deep resentment toward Isagi for stealing not only the final goal but also Sae Itoshi's acknowledgment as a true striker, something he craved more than anything else. Rin claimed that he would "kill" Isagi, thus making him his primary target and rival. Throughout the Neo Egoist League, his singular focus was to become stronger so he could finally "kill" Isagi once and for all in the final selection's last match. Ultimately, after finally discovering his ego, Rin arrogantly no longer viewed Isagi as a threat, but rather as another stepping stone, which resulted in his humiliating defeat, when Isagi scored the winning goal against him. This made him acknowledge that Isagi has evolved into Blue Lock's "Demon King" and the epitome of what it means to be a "Neo-Egoist".

Ryusei Shidou Shido is tall, tanned young man with a height of 6'1 or 185 cm spiky blond hair with fading pink at the tips, having two strands falling on both sides of his face. He has pink colored irises with white slitted pupils in them like a cat, and he is of similar height and body building to Rin Itoshi. He is very expressive and is often seen with a joker-like grin or smirk.

Shido is an eccentric player in Blue Lock who has a strong penchant for violence or, more specifically, physical altercations. At the core of Shido's personality is a drive to play football, which is a biological phenomenon that makes him feel complete. Shido scores goals to pass on his genes and leave his mark on the world; it is his sole focus. He gets excited from playing high-level football with other high-level players and is bored if people cannot make him "explode" or don't "explode" themselves.

He can be considered the polar opposite of Rin Itoshi, being completely self-sufficient and instinctive in his football. A noticeable trait of Shido's has been his propensity for violence to get what he wants, often being unwilling to work with most people (if anybody at all). He seems completely aware and content with the toxicity of his behavior and only feels slight remorse once he is electrocuted and locked up for being overly aggressive and threatening serious bodily injury to others.

He seems to get over such feelings when Sae Itoshi releases him from his behavioral captivity, who asks him to join him in playing high-level football and is cleared to act however he wants as long as it's for Sae's sake. When released from Blue Lock under Sae's supervision, he seems to be even more openly violent and causes frequent quarrels with the Japan U-20 team's ace player Shuto Sendo, who initially doesn't respect Sae.

Shido can be openly friendly and even affectionate towards others, such as Sae Itoshi, who gave him the opportunity to play with him and evolved his level of play in the process, showing him a type of football he has never experienced before. Shido can also be overtly and unnecessarily sexual at times, and though he is prone to violence, he also learns how to control his violent rampages in exchange for playing high-level football longer. Shido is able and willing to acknowledge other people's skills, praising Isagi for making the "best play" of the first game of the Third Selection (when Rin wouldn't) despite Isagi stealing a goal from him. By the time of the Neo Egoist League, Shido is able to control his anger and violence enough to share the field with his most hated rival, Rin Itoshi.

Rin has an antagonistic relationship with Ryusei. Despite having nearly the same superior football skills and techniques, Rin and Ryusei can be described as polar opposites and it is extremely difficult for them to play on the same team since they both are top players and egotists who have different approaches to the game. It is very surprising they were not only able to win every game in Third Selection as the main duo of Team A, but also have won every game so far in the Neo Egoist League on PXG. When they are not fighting during the game they are starting physical altercations with Ryusei being the instigator. Ego also stated that they were unable to spark a chemical reaction with each other even once during their matches and thus could never be on the same team together. Their tense opposition made Ego decide to replace Ryusei on the Blue Lock 11 lineup and was a backup wild card of "Joker" just in case Rin Itoshi could no longer play. Out of nowhere, Ryusei was chosen to assist and play with Sae Itoshi in his mission to test out the players and system of the Blue Lock Project, which scorned him even further. Yet, they managed to put aside their hatred towards each other and managed to work well in the Neo Egoist League. Given they were incapable of working well together, both players were given their own respective formation by their Master Striker Julian Loki, as a result both players managed to shine in their respective moments. However, in the final match against Bastard München, they both agreed on Julian's unpredictable plan on having the two of them in the same formation, showing how much growth they've achieved since their first clash.

Bachira Meguru

Bachira is a young man with a slim build, height of 176 cm or 5'9, and an oval-shaped face. He has bright yellow eyes and mod-cut hair that reaches up to his chin and is black with golden under-lights (when Bachira was younger, his hair was only ear-length). When he was in a junior football league, he wore jersey #8. During the Chiba Prefecture Tournament, Bachira wore the #8 jersey for Namikaze High, which had a special bird design in the center.

Bachira has a rather eccentric demeanor and personality. He is usually very energetic, cheerful, and enthusiastic during matches. Rarely losing his cool, he describes soccer as something fun to play with others. Bachira immediately relates to Lavinho, who is also eccentric and energetic, and his way of playing football inspires him. He has a tendency to sleep in unexpected moments, such as when he was sleeping during the tag test. He mostly oversleeps and ends up relying on Isagi or Kuon to wake him up, and then falls asleep during their team meetings; he's also been known to fall asleep during meals. He also tends to show up completely naked after every training and soccer matches. When the Neo-Egoist League starts, Bachira takes his football training more seriously in an effort to become the world-class egoist he imagines himself to be and edge closer to becoming the best in the world. Bachira now actively weight trains and mediates.

During his childhood, he was bullied because of his eccentric personality and exceptional skill in football, which made him terrified of being alone. This trauma causes Bachira to create an imaginary friend who is a "monster", more specifically a football monster, because it motivates Bachira and his plays in the game. Only after he comes to Blue Lock does Bachira start facing his trauma for he finds people he is similar to and can call friends, like Yoichi Isagi. Bachira can be seen casually befriending all sorts of people despite his somewhat strange demeanor, including Isagi, Rin, Chigiri, and Kunigami.

After the rematch between Isagi's Team White and Rin's Team Red, Bachira has moved past his previous trauma and has decided to be more confident and dominant on the field. He wants to become the world's best striker who scores only for himself, and thus will only pass someone the ball if they have the potential to excite him and help him play the kind of football he wants to play. Bachira has also steeled his resolve for moving forward in Blue Lock; no matter the challenge, Bachira looks optimistically at the situation, resolving to get stronger and reach the peak of each trial ahead of him.

Rin and Bachira intially meet during the first match of the Second Selection in which Bachira, Isagi, and Nagi on Team White face off against Rin, Aryu and Tokimitsu on Team Red. After losing to Team Red, Rin voices indiference about which player to pick to join their team, and does not protest when Aryu asks for Bachira to join them.

While waiting another team to play against, Rin and Bachira train together, much to Rin's annoyance. Ultimately, Rin gives Bachira some candid advice that stays with Bachira going into their next match. Rin helped Bachira push his football skills in an attempt to win, and Bachira was more than willing to step up to the high plate that Rin and Isagi had set for him. After he broke through his trauma and became someone who is fighting for the world's best striker, Bachira becomes someone Rin trusts on the field and is closer than most people to a friendship with him.

His given name, Rin (凛りん?), means "cold" or "dignified". Phonetically, the pronunciation of his given name (りん) is homophonous with the Japanese word for "phosphorus" (燐りん, Rin), an element in water known for it's corrosive properties. His surname, Itoshi (糸いと師し?), means "Threadmaster"; a master of strings or puppeteer, referencing his puppet-controlling playstyle. Ito (糸いと?) meaning "thread", "yarn" or "string". Shi (師し?) meaning "master", "teacher", or "reverend". His name can thus be interpreted as "A Dignified Threadmaster".