Development
One of the most challenging tasks the Disney studios went through during the making of the film was finding the perfect Pinocchio. The animators tried and tried to get the right wooden boy. The task was so frustrating that Walt Disney actually ceased production on the film until they were able to find the right Pinocchio. Soon enough, animator Milt Kahl created a small piece of animation that would eventually become Walt Disney's Pinocchio.
In early drafts, Pinocchio retained his more obnoxious traits from the original story, but Walt hated the direction as Pinocchio was not likeable enough. Eventually, further development lead to Pinocchio taking on the more innocent traits that he has in the final film.
Personality
“Remember, a boy who won't be good might just as well be made of wood”
―The Blue Fairy
Once he's given life by the Blue Fairy , Pinnochio acts his age, being very whimsical, childlike, naive, and impressionable. Because of his youthful ignorance, he can be seen as rather mischievous, and often lands himself into trouble; albeit unintentionally. This is seen several times throughout the film, and the trait, unfortunately, makes Pinocchio an easy pawn in the schemes or motivations of various villains and antagonists. Even so, as the film progresses, Pinocchio notably learns from experiences and takes them into account; eventually becoming selfless, sensible, heroic, and obtaining impressive leadership qualities. This is finally put into the forefront once the film nears its climax, as Pinocchio is faced with the task of rescuing his father from the jaws of the deadly whale, Monstro. Pinocchio's daring decision to risk his life for his loved ones ultimately grants him his wish of becoming a real boy.