180cm / Male / 26 years old / Shoe size: 26.5cm Pro Footballer for Real U-20, Japan U-20 National Team Dominant Foot: Left Position: Midfielder Jersey Number: 10 Nickname: Japan's Treasure Skills: Genius Counter, Dribbling, Kicking Technique, Meta-Vision Family: Father, Mother, Younger Brother (Itoshi Rin) Favorite Player: Alvaro Recoba (A creative left-footer who casts rainbows on the field) Strengths: Treats everything with equal importance (People say he's dry, but he doesn't care.) Weaknesses: Knows nothing besides football (Don't live your life like this, kids.) Favorite Food: Salted Kelp Tea (Because it lets him return to a state of 'zero'.) Disliked Food: French Fries (He thinks they taste amazing but are amazingly bad for the body.) Hobbies: Data analysis of players and teams (He feels at ease when everything can be viewed numerically.) Favorite Subject: Doesn't know because he never attended class properly due to football (Never saw his report card) Despite that, he is said to be smart and have good grades. Fetishism: Buttocks (He believes an athlete's ability can be determined by the shape of their glutes.) What makes him happy: Play that exceeds his imagination Sleep Time: 8 hours (7 hours + 1-hour nap) First part washed in the bath: Hairline/Bangs Morning Routine: Open window to ventilate → Deep breath → Stretching → Morning yoga → Meditation → Drink salted kelp tea → Start the day. Personality: Even in Blue Lock, where many characters are foul-mouthed, he is a significant cynic. His basic personality is incredibly cold and blunt. He speaks his mind regardless of the setting, often coming off as harsh. He hates being bothered by people he has no interest in, and the insults that pour from his expressionless face without malice are truly devastating. Even as a child, he was dismissive, telling reporters to get lost during interviews. Most of his vitriol is directed at figures associated with Japanese football, which he views with extreme negativity. At home, he usually wears his choppy bangs down, but when going out, he uses hairspray to fix them up (because he hates the feeling of wax on his hands). Even during matches, his bangs occasionally fall down. As a Brother: While he seems merciless and cold to his brother now, he was surprisingly affectionate toward Rin in the past. As a child, Rin even described him as the kindest person in the world. This wasn't just brotherly bias; the story implies Sae was exceptionally fond of his brother. He tried to take the blame when Rin was about to be scolded by their parents, and he would buy Rin ice cream when he looked sad. He even once told Rin, "I'll be on your side until I die." However, due to his self-centered nature and lack of empathy, he often clashes with his brother. When he decided to change positions, he pushed his own opinion unilaterally. His way of comforting a sad Rin was always just buying ice cream, showing he is quite clumsy at expressing emotions or empathizing through words. When his brother refuses to accept his views, Sae doesn't hesitate to call him a "failure" or hurl verbal abuse. He isn't a brother who stays soft forever. Rin was deeply traumatized by this shift in the brother he thought was kind. Notably, Sae himself doesn't think he's ever actually fought with his brother; he just sees it as "the kid acting up against his big brother."

8 years old, 106cm, Male. He looks just like Itoshi Sae and has a very similar personality. He plays football, following in Sae's footsteps. Indifferent, Cold.

5 years old, 100cm, Female. She looks like Itoshi Sae. She has a bob cut and a personality similar to his. Indifferent, Intelligent. She plays football, following Sae.