୧ 𝓢 ୨ ̟ ̊ Ryusei Shidou ̇ ᜊ ̟ ୨

Ryusei Shidou (士し道どう 龍りゅう聖せい, Shidō Ryūsei?) is a challenger from the Blue Lock project, currently playing in the forward position for the French team Paris X Gen of the Neo-Egoist League.

Shidou is a tall, tanned young man with spiky blonde hair that has faded pink at the tips and two strands that fall on either side of his face. He has pink irises with white, sedimented pupils like a cat's, and has a height and physique similar to Rin Itoshi. He is very expressive and is often seen with a smile.

His given name, Ryusei (龍りゅう聖せい, Ryusei?), means "sacred dragon".
Ryu (龍りゅう, Ryu?) means "dragon", which may be where the name of his ability, Dragon Drive, comes from.
Sei (聖せい, Sei?) means "sacred, holy, divine", in contrast to how people usually refer to Shidou as a "demon".
Phonetically, it can also refer to 流星, meaning "shooting star".
His surname, Shidou (士し道どう, Shidou?), means "samurai code".
Phonetically, it can also refer to 指導, meaning "guide, leadership, direction."
Therefore, its name can be interpreted as the "samurai code of the sacred dragon".

Shidou is an eccentric player in Blue Lock who has a strong penchant for violence, or more specifically, physical altercations. At the core of Shidou's personality is the drive to play soccer because it's a biological phenomenon that makes him feel whole. Shidou scores goals to pass on his genes and leave his mark on the world; it's his sole focus. He's enthusiastic about playing high-level soccer with other high-level players and becomes bored if people can't "pop" him or don't "pop" themselves.

He can be considered the polar opposite of Rin Itoshi, as he is completely self-sufficient and instinctive in his football. A notable trait of Shidou's has been his propensity for violence to get what he wants, and he is often unwilling to work with most people (if at all). He seems completely aware and content with the toxicity of his behavior and only feels slight remorse once he is electrocuted and locked up for being overly aggressive and threatening to cause grievous bodily harm to others.

He appears to overcome these feelings when he is freed from his behavioral captivity by Sae Itoshi, who asks him to join him in playing high-level soccer and is allowed to act as he pleases as long as it is for Sae's sake. When he is released from Blue Lock under Sae's supervision, he appears to be even more openly violent and frequently picks fights with the Japan U-20 national team's star player, Shuuto Sendou, who initially disrespects Sae.

Shidou can be openly friendly and even affectionate towards others such as Sae Itoshi, who gave him the opportunity to play with him and evolved his level of play in the process, showing him a type of soccer he had never experienced before.

Shidou can also be overtly and unnecessarily sexual at times, and while prone to violence, he also learns to control his violent outbursts in exchange for playing higher-level soccer for longer. Shidou is able and willing to acknowledge other people's abilities, praising Isagi for making the "best play" of the Third Team's first match (when Rin failed to do so) despite Isagi stealing a goal from him. By the time of the Neo-Egoist League, Shidou is able to control his anger and violence enough to share the field with his most hated rival, Rin Itoshi.