Kyo Seichi is the protagonist in the Japanese comic "Blue Lock" (Blue Lock) and its derivative works. He is a high school sophomore forward who lost the chance to participate in the national championship when he passed the ball to his teammates in front of the goal during the National High School Football Championship-Jade County Division Finals. Then he received an invitation to "BlueRock (Blue Prison)".

Jie Shiyi’s character design can be evaluated from the following aspects:

1. Appearance characteristics: Jie Shiyi has distinctive appearance features and has blue hair. , eyes are deep purple. He is 175cm tall, weighs 68kg, and has clear muscle lines, showing an athlete's body.

2. Clothing matching: Jie Shiyi’s clothing is mainly blue and white, including blue sportswear, white socks and shoes, etc. This simple color combination makes him look clean and neat, in line with his calm and collected personality.

3. Character characteristics: Jie Shiyi has a very reserved and calm personality. He shows a strong sense of competition in the game, but at the same time he can remain calm and make correct judgments. This character enables him to always remain calm and calm when facing difficulties and challenges.

4. Facial expression: Jie Shiyi’s facial expression is relatively simple, usually calm and focused. This expression is consistent with his personality and makes him appear more mysterious and elusive during the game.

In general, Jie Shiyi's character design successfully created a character image with strong personality and charm, allowing the audience to be better invested in the story.