! . 𝚰s͟α𝗀𝗂 𝐘ⱺi͟c͟h͟i͟ ۶ৎ

Japanese
潔 世一
Rōmaji
Isagi Yoichi
Alias(es)
"Demon King of Blue Lock"
"Heart of Blue Lock"
"The Neo-Egoist"
"Egoist Machine"
"Genius of Adaptation"

male

17

April 1

175 cm

B

dark blue

blue

Isagi family
Iyo Isagi (mother)
Issei Isagi (father)

Student

Blue lock

Ichinan High School

Bastard München (Starter)[14]
Japan U-20[15]

Forward
Offensive Midfielder

Spatial Awareness
Adaptability
Direct Shot
Off-the-Ball Movements
Reflex
Metavision
Flow State
Two Gun Volley

Yoichi Isagi (潔いさぎ世よ一いち, Isagi Yoichi?) is the main protagonist of the Blue Lock series.

Isagi is a second-year high school student from Saitama who initially played as a forward in high school. Unlike his fellow competitors, who were scouted by Anri Teieri, Isagi was chosen personally by Jinpachi Ego himself after seeing him play. Isagi's main goal is to become the world's best striker.

After surviving the many trials and tribulations of Blue Lock, Isagi is ranked #1 in the program alongside Rin Itoshi and is seen as one of the most exciting talents in football with an offer from an unkown team the end of the Neo Egoist League.

Isagi is a player who is wholeheartedly focused on being the best player on the field in every game. He doesn't care if he has to do things himself, urge his teammates to help him, take advantage of the ever-shifting feelings and emotions on the field, or completely set aside his pride and emotions to be a logical and efficient football machine that exists solely to win, ideally by scoring goals.

Following the end of the Neo Egoist League, Isagi has qualified to become one of the 23 players for the new Japan U-20 team entering the upcoming PIFA U-20 World Cup.

Isagi is a teenager of slightly above average height 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.

While attending Ichinan High School, he wore an unbuttoned blazer over a white undershirt and striped tie. Both the Ichinan High jersey and gym uniform are light-colored with black stripes.

At Blue Lock, Isagi wears the standard-issued body suit (black with blue stripes) and tracksuit. During the First Selection, he wore Team Z's blue #11 jersey and Team Z's gray-capped cleats. During Second Selection, he wore Team White's #15 jersey and later switched to red. He then later switched to Team A's black #15 jersey during the Blue Lock Eleven tryouts.

Isagi dons an official blue-colored Blue Lock player uniform with the #11, that looks very similar to the ones seen in the first cover spread minus the Japan flag during the Japan U-20 match.

As a regular for Team Germany, Isagi wears the red and black with gold stripes Bastard München uniform as #11.

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 first met Bachira when Kunigami told him to watch where he's going. Isagi looks down and sees a player sleeping on the floor. A sleeping Bachira surprises Isagi. [1] Isagi was at first unsettled by him and his eccentric demeanor but they quickly bonded after their first match against Team X.They train together pretty often and Bachira has stated that he believes in Isagi multiple times which is why he always passes to him. Bachira implies that he constantly sees a "monster" inside and around Isagi, like himself. Before the match against Team V, he reaches out to Isagi to tell him that he'd be lonely without him if they lost the match and never got to see each other again, to which Isagi agrees. Isagi might be the first real friend Bachira has had in years since he began being bullied but even without him around he is still able to connect with other strong players like Itoshi Rin. They initially became teammates in the Second Selection of Blue Lock along with Nagi but Bachira was stolen away by Rin when their team lost. Isagi made a promise to reclaim Bachira and beat Rin the next time but he failed to do that, albeit barely. Even then Isagi was picked next by Rin and thus their friendship was not damaged or hindered and they kept playing football together against the World Best. When in Third Selection, they did not play anymore official games together in Blue Lock, though they both made the Blue Lock Eleven starting lineup and faced the Japan U-20 together. They are seen celebrating together on the field when Blue Lock scores or when the first half ended indirectly causing their parents to meet. By the time of the Neo Egoist League, Bachira has become a dear friend to Isagi who gives him sound advice and supports his friend as the aim for best striker in the world.

Isagi's first encounter with Kunigami happened with a flying shirt. Kunigami was changing his shirt and accidentally threw it at Isagi. With Kunigami's chest bare, Isagi was impressed by Kunigami's physique and power on the field and also his strong sense of morality and proper way of doing things seen during the game of tag. Isagi trusted him enough to make the last point of their first game against Team X, and even though it didn't do much for their team, it solidified their budding friendship. They went on to complete First Selection together and since then separated due to Isagi going on ahead with Nagi and Bachira. They met again during the middle of Second Selection and went up against each other in a 3v3: Rivalry Battle. Isagi's Team White managed to win but Isagi did not choose Kunigami; it was the decision he thought was best to get further in Blue Lock and though he was sorry he kept walking forward. Kunigami respected his decision and decided to ingrain in his mind this loss and not to look away as his possible best friend walked ahead. Kunigami was in Isagi's thoughts always and he was surprised when he did not make it to the Third Selection but instead was knocked out by Ryusei Shidou. Once Kunigami returned from his time in Wild Card, he became noticeably colder and serious to Isagi. Though Isagi is the only person in the Germany Stratum Kunigami talks to, he is constantly rude and condescending to Isagi who reciprocates the feeling. Even though Kunigami has become a threat on the field, Isagi does not have to worry about him interfering in his plans to become the world's best striker. After the game against Manshine City, Isagi asked Kunigami for advice on improvement and even though Kunigami was reluctant to help he ended up aiding Isagi in his own way and decided to play a game of 2v2 with him, Bachira, and Chigiri for old times sake.

Isagi and Chigiri were initially indifferent towards each other. Only really interacting when the team was communicating as a whole. Their first one to one interaction was the night after their game against Team Y and Isagi found Chigiri in the monitor room. Chigiri noticed Isagi's restlessness and helped explain spatial awareness to Isagi but when Isagi asked about Chigiri's weapon he revealed his former leg injury and his resolve in finding a reason to quit football at Blue Lock. This interaction ended poorly and made the two avoidant of each other. As Team Z struggled against Team W, Chigiri saw Isagi try so hard to win despite the odds, like he use and after Isagi assaulted him trying to keep the ball moving Chigiri was finally pushed into the action. The play that followed bonded Chigiri and Isagi and they have become respected rivals of each other. They know each other's strengths and weakness very well and they constantly get in each other's way when playing for opposite teams. However, as teammates they have a good chemistry, with Isagi relying often in the speed of Chigiri, while on the other side Chigiri trusts Isagi and his capacity to observe and analize the field and the players in the game. Outside of the field, Isagi and Chigiri have a friendly relationship getting along very well. After the match against Japan U-20, Isagi meets Chigiri with Bachira and spend most of the day playing together bowling.

Isagi initially meets Nagi during the First Selection in the cafeteria when Wataru Kuon tries betraying Team Z to avoid getting expelled form Blue Lock. They have more of an interaction during the last game of the First Selection and they both witness each other's skills and presence on the field. Isagi sees Nagi's insane ball control and trapping ability while Nagi begins to recognize not only Isagi's spatial awareness ability but his potential and overall influence on the field. Isagi might be the first person Nagi fully respects because he forsakes his relationship with Reo just to play on Isagi's team because Isagi creates an opportunity for Nagi to further develop his football ability and play the kind of football he wants.

As teammates on the field, they have an incredible chemistry and understanding of each other. Isagi takes full advantage of Nagi's trapping skills and ball control and Nagi takes advantage of Isagi's ability to create chance opportunities and the best plays, sometimes pushing him to the limit get the goals he wants. They are an unstoppable duo in the Second Selection slowly climbing up the ranks and acquiring some of the most powerful players in Blue Lock after their initial lose to Rin's Team Red. They lose a second time to Rin's Team Red in the Second Selection due only to "luck", really showing how powerful they are as a team and how much they can develop in a short period of time together. When Isagi was chosen by Rin to continue on, Nagi promised to climb up and meet Isagi along with everybody else and Nagi watched as Isagi went on ahead to face the World's Best.Off the field, Nagi goes back to his mostly indifferent personality and does his own thing ignoring what Isagi and everyone else says in favor of watching something or playing a video game on his phone. Though he does listen to what Isagi has to say when he is trying to speak logic on or off the field.

Reo and Isagi had their first encounter in each other's respective matches, Team V and Team Z. After the tie against the both teams, Reo, who was with Nagi, met Isagi and Bachira for the assortment of teams in the Second Selection Arc. Nagi's choice to team up with Isagi bestowed emotions to Reo that somewhat resemble jealousy, and this evolved Reo's hesitant attitude towards Isagi to plain, utter hatred (disguised as admiration). He became determined to overcome Isagi, in order to regain Nagi. Since the Third Selection however, their relationship has become more of an amicable and arguably friendly rivalry towards each other especially after having after having a heart to heart about their respective feelings about catching up to Nagi and Rin's skill level, as well as Nagi clearing up the misunderstanding surrounding the Second Selection. Isagi also discovered that Reo is one of the only few in the Neo Egoist League to manuever Metavision, although Reo did it unconsciously.

When Isagi first met Ego, he wondered what was going in his head. Unlike most of the invited players, Isagi didn't outright disagree with Ego's ideologies. After hearing Ego's statement about egoistic strikers and the dream of the World cup, Isagi was persuaded and he was the first person to run toward the entry to Blue Lock. [2]

After the game of tag, Ego commends Bachira and Isagi for choosing to aim for stronger players. He states that those are perfect examples of tenacious people who pursue their own egos. Ego remarks that it is exactly the egoism he is looking for in Blue Lock. [3] Ego goes on to view Isagi's growth as an egotist and a football player and even publicly commends him on his ability to shadow and motivate Rin Itoshi.

He chose him as an offensive midfielder for the Japan National Representative match and when Blue Lock was losing due to Ryusei Shido's presence, Isagi ran to him asking for help. Instead of listening to Ego talk about a strong and secure future for Japanese football and the players of Blue Lock even if they do lose the game ,he clearly and adamantly states he doesn't care about any of that; the team and him only care about winning so he tells his coach to give him the answer and Ego obliges him, impressed by his passion and ego.

It is implied that Isagi and Ego share a similar perspective when it comes to football as noted by Noel Noa and Isagi was personally chosen by Ego to participate in Blue Lock unlike the others who were handpicked by Anri.

Isagi’s first impression of Rin came from the beginning of the Second Selection when Rin showed his talent by kicking two soccer balls that collided with one another in the air.

Their first official interaction is in the Second Selection, in the 3v3 matching area. After gaining the knowledge the winners can steal a player from the losing team, Isagi’s ego leads him to challenge Rin’s team. In the match Rin scores a goal at kickoff, which is the start of their rivalry. During the match, Isagi calls Rin lukewarm (the latter’s catchphrase) for underestimating him. At the end, Rin sees through Isagi’s plan and ends up winning, deciding to steal Bachira.

They meet once again in the fourth stage, and Isagi loses once again, 4-5. The game came down to a matter of luck, which Rin admits saying he was unable to read the last play. Because of this, Rin feels defeated so he decides to choose Isagi as the one joining the team. Rin says Isagi cannot sink here because he must watch in the front row as he becomes the best.Isagi is determined to catch up, stating he sees Rin as his rival. Rin, however, states Isagi is nothing to him. He lost this time, but claims there will not be another.

Noel is Isagi's role model, whom he idolizes and deeply admires. In the Neo Egoist League, Isagi is greatly surprised and excited to see his favorite player in Blue Lock as a coach, and without a doubt chooses to play in Bastard München because it's the team Noel would be guiding, not letting escape the opportunity to learn from the best striker in the world.

During the final match against Paris X Gen, after learning that Noel has been using Isagi from the very beginning into helping his rival Michael Kaiser discover his hidden ego, he seemingly lost form of respect and reverence towards his now former idol, instead he has become terrifyingly rageful and focused into defeating him, Kaiser, and all who saw him as a stepping stone for their own ambitions. As a result, Isagi discovered a new ego, which relies on him "selling his soul for the sake of winning", he no longer cared about being the star or even being able to surpass "geniuses" in soccer, all that mattered to him was winning at any cost. Earning him his former idol Noel's respect, who accepted Isagi's grand public challenge to best him in the upcoming world cup.

They first met during the Neo Egoist League. From the very first time they saw each other they've had a complicated relationship. Isagi can't stand Kaiser's arrogant behavior and being looked down by him, Isagi also sees Kaiser a rival and his biggest obstacle in Bastard München and in the entire the Neo Egoist League. Despite the animosity between, Isagi respects Kaiser as a football player and tries to learn from him in order to surpass him. Isagi views Kaiser as an obstacle to dismantle, and Kaiser views Isagi as an opponent to devour during play. After being bested and humiliated by him twice, during their match against Manshine City and then with Ubers, Isagi became Kaiser's main target. He no longer cared about the new offer, of joining Re Al, his only desire became to best him. Ultimately, after finally discovering his ego, in the final match against Paris X Gen, he lets go of his fixation in beating Isagi and instead focused only on scoring goals for himself. This led into him to becoming Isagi’s partner to best PXG’s genius players and finally win the Neo Egoist League. After the match, Isagi thanked Kaiser for being most useful pawn, throughout the league.