Tabito Karasu (烏 旅人, Karasu Tabito) is one of the most intelligent and tactically gifted contenders in the Blue Lock Project, recognized for his exceptional analytical abilities, defensive awareness, and talent for manipulating the flow of a match. During the Neo Egoist League, he played as a center midfielder for France's Paris X Gen (PXG), later becoming one of the key players chosen for the new Japan U-20 National Team. When he was first introduced, Karasu was ranked #3 during Blue Lock's Third Selection, establishing himself as one of the highest-rated players in the project. He later played as a defensive midfielder during the match between the Blue Lock Eleven and the Japan U-20 team, where he demonstrated his leadership and strategic abilities. Following the conclusion of the fifth round of the Neo Egoist League, Karasu ranked 11th overall, securing his position as one of the 23 players selected for the new Japan U-20 team. He currently plays as a defensive midfielder for Japan U-20. During the Neo Egoist League, he received the nickname "Assassin" due to his precise and calculated style of play.

Physically, Karasu is a tall and lean young man with a sharp appearance. He has spiky dark purple hair with lighter purple highlights toward the back and a noticeable pompadour-like spike at the front. His eyes are blue, and he has a distinct mole located underneath his left eye. Throughout Blue Lock, Karasu wears the standard-issued black bodysuit with gray stripes and matching tracksuit. During the Second Selection, he wore Team Red's #69 jersey, while during the Third Selection he represented Team B wearing the white #69 jersey. Once the Japan U-20 match began, Karasu switched to the official Blue Lock player uniform, wearing the #6 jersey with long sleeves and gloves. During the Neo Egoist League, he wore Paris X Gen's official uniform, also featuring sleeves and gloves. During the U-20 World Cup, he wears the Japan U-20 uniform while continuing to use gloves.

Karasu possesses a sharp, observant, and highly analytical personality. He is someone who constantly studies his surroundings, identifying the strengths, weaknesses, and habits of everyone around him. Because of his ability to recognize flaws in others, Karasu often looks down on people he considers "mediocre" and has a habit of using his sharp tongue to criticize, tease, and provoke both allies and opponents. He rarely misses an opportunity to insult someone, regardless of whether they are his friend or enemy. Karasu follows his own strict set of rules and expectations, often attempting to control situations so that matches unfold according to his plans. Because he dislikes unexpected changes or mistakes, even small inconveniences can make him appear as though he is constantly complaining.

Despite his harsh attitude, Karasu is incredibly intelligent and skilled at creating chemical reactions between players. He understands how different personalities and abilities interact on the field and uses that knowledge to maximize his team's potential. During the Japan U-20 match, Karasu displayed remarkable leadership from the defensive midfield position, frequently communicating with his teammates and organizing strategies against the rapidly advancing U-20 players. He directed players such as Yo Hiori and Kenyu Yukimiya in both offensive and defensive situations, even when they already understood their roles. Karasu is also willing to exploit every advantage available to him, such as when he appealed to the referee and requested Ryusei Shidou receive a card after Shidou accidentally kicked Rin Itoshi in the face.

However, beneath Karasu's confident and critical exterior lies a much more complicated personality. Despite constantly judging others, Karasu secretly considers himself to be mediocre. His habit of discovering people's weaknesses and teasing them is actually a defense mechanism designed to prevent others from noticing his own insecurities. Karasu is painfully aware of his own limitations and respects those he views as truly extraordinary. This mindset is what allowed him to work so well alongside Eita Otoya, as their personalities and abilities naturally complemented each other. Ironically, Karasu's extreme awareness of both himself and others is exactly what makes him exceptional in his own unique way. His ability to understand human behavior, analyze situations, and exploit opportunities is what separates him from ordinary players.

Karasu is also known for his strong compatibility with other players. He previously played on the same youth team as Yo Hiori, and during Blue Lock he was teammates with Eita Otoya during the First Selection and Kenyu Yukimiya during the Second Selection. Although he can be difficult to approach due to his blunt personality, Karasu's intelligence and reliability make him a valuable teammate.

According to the official Blue Lock Egoist Bible, Karasu was born in Osaka, Japan. He is afraid of water, despite being a highly capable athlete. His favorite song is Grapevine's "Fly," and his favorite drink is kelp tea. His favorite animal is the hawk, reflecting his sharp vision and predatory approach to analyzing opponents. His favorite football player is Ruud van Nistelrooy. His favorite manga is GANTZ, specifically the Osaka arc, while his favorite television program is Documental (HITOSHI MATSUMOTO presents ドキュメンタル), a comedy show where ten comedians compete to make each other laugh. His favorite school subjects are Japanese Literature, Chemistry, and World History, while his least favorite subject is Swimming. His hobby is observing, analyzing, and assessing humans, something that perfectly reflects his personality and playing style.

Karasu has several personal preferences and habits that reveal his more unusual side. He prefers bamboo shoots over mushrooms. When bathing, the first thing he washes is his hair because he uses a large amount of hair wax to maintain his hairstyle. He gets approximately 6.5 hours of sleep every night. He has a voice fetish and is attracted to smart and strong girls. He remembers his first crush very clearly, saying that he was eight years old and that her name was Marisa. However, he believes he is mediocre because she was the cutest girl in his class. He received six Valentine's Day chocolates the previous year.

Karasu has a complicated relationship with emotions and happiness. He refuses to tell anyone about the last time he cried, and receiving surprise gifts actually makes him sad because he dislikes being forced to feel happy or react a certain way. His personal weakness is that he struggles to be kind toward people he considers mediocre, though he acknowledges that it is something he needs to improve. When asked who the best gentleman in Blue Lock is, Karasu ranked second among the "Three Best," behind Kenyu Yukimiya.

Karasu's morning and personal routines reflect his disciplined nature. Before important matches, he relies on careful preparation rather than superstition. When asked what he requested from Santa as a child, he revealed that he continued receiving Christmas presents until around age ten, with his final request being a PlayStation 4 and an e-football game. If he received ¥100 million, he says he would invest the money into index funds. The majority of this information originates from the official Blue Lock Egoist Bible.