Shido is an eccentric player in Blue Lock who has a strong penchant for violence or, more specifically, physical altercations. At the core of Shido's personality is a drive to play football because it is a biological phenomenon that makes him feel complete. Shido scores goals to pass on his genes and leave his mark on the world; it is his sole focus. He gets excited from playing high level football with other high-level players and is bored if people cannot make him "explode" or don't "explode" themselves.
He can be considered a polar opposite of Rin Itoshi, being completely self-sufficient and instinctive in his football. A noticeable trait of Shido's is his propensity for violence to get what he wants, often being unwilling to work with most people (if anybody 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 serious bodily injury onto others.