Seishiro Nagi⁹

Nagi is a remarkably tall teenager. He has white hair that leaves a V-shaped fringe between his eyes like Isagi. He has grey eyes with large irises.

When he was in high school, Nagi wore a school uniform consisting of a white sports jacket with a cascading star pattern on the collar, though underneath he wore a dark hoodie instead of a dress shirt and tie. He wore dress pants and dress shoes as well.

Personality Nagi is a lazy and relaxed guy; before the end of the First Selection of Blue Lock, he was an uninterested and lazy boy who sought the solution that required the least effort, having almost no interest in football and only playing it due to Reo's constant requests.

In his match against Team X in the First Selection, Nagi began to show signs of his "passion" because he had to really exert himself to win; however, it was his encounter against Team Z that marked him. He saw that everyone on his team was being outplayed, yet they managed to tie the game despite Nagi giving his all. Even after being defeated, his passion was so great that for the first time he took the initiative and tried to talk to Reo to score two goals quickly before time ran out. However, time ran out seconds later, and he ended up losing, experiencing true defeat and frustration.

After his defeat, Nagi completely changed his way of thinking. A great passion for football began to grow within him; for the first time in his life, he found something that motivated him to strive and not take the easy way out. Even so, he maintains his lazy and carefree attitude in other things, but his passion for football remains.

His zodiac sign is Taurus. His hometown is Kanagawa. Her foot size is 28.5 cm. His blood type is O. His dominant leg is the right one. He doesn't have a favorite soccer player because he doesn't know any of them. He started playing football at the age of 17. He thinks his strengths are that he is a pacifist, he doesn't fight and he doesn't get angry. He thinks his weakness is that everything bothers him. Her favorite food is lemon tea. Her least favorite food is crab because it's a pain to have to get the meat out of the shell. He believes that the best thing to accompany rice is anything. He doesn't want to have to think about it. His hobbies are playing mobile games, reading manga on his phone, and watching videos on his phone. Her favorite season is spring. His favourite song is 'Kiseki' by Quruli. His favorite movie is Eternal Sunshine of the Spotless Mind. His favorite manga is Bonobono, a Yonkomanga series created by Mikio Igarashi. The color of his character is black. His favorite color is gray. Her favorite animals are sloths, koalas, and pandas because she thinks they seem to have an easy life. His best school subject is History and his worst subjects are Politics and Economics because he has no interest. He often reads Shounen Jump, Weekly Shounen Magazine, Young Jump, and Weekly Young Magazine. He likes it when no one bothers him. He doesn't like having his free time taken away. Received a total of zero Valentine's Day chocolates last year. Sleep 8.5 hours every night. The first thing you wash before getting into the bath is your whole body at once, otherwise it is painful. Its most used applications are YouTube, Shounen Magazine Pocket, Jump+, Comic Days, Line Manga and various types of games. The last time she cried was when she let out a big yawn that brought tears to her eyes.

He received Christmas presents from Santa until he was 9 years old; the last thing he asked Santa for was 10,000 yen for gacha pulls. If it were my last day on Earth, I would say: "It's painful to think about how I would spend it. Whatever happens, happens." If I received 100 million yen, I would use it to cover all my living expenses so I wouldn't have to work. He spends his free days lazing around playing mobile games, watching videos, and reading manga. It's capable of catching multiple things, even those unrelated to football, like Barou's shoes. In volume 8, chapter 69, Nagi held a "Catch-What-You-Can Championship". He lives alone (his parents travel a lot, but he has a friendly relationship with them). He has a cactus named Choki. He named the cactus because it was shaped like scissors, which reminded him of the game "Rock, paper, scissors," and because scissors in Japanese sound like "Choki."