Scout is a round character (we learn about the many sides of her personality, such as her willfullness, curiousity, compassion, physicality, etc.) and a dynamic character, in that she eventually learns something about the world and changes as a result. She understands that people (and towns like Maycomb) are many things; that innocence is not a guarantee of safety, that racism blights communities and destroys lives. Scout chooses a perspective and opinion by the end of the novel and she is not the same person she was at the beginning.
Scout is very intelligent and a "seeker" (hence her name, I expect). She is guided by her father, Atticus, who teaches her respect, both for herself and for others. Scout does not fit into the traditional (esp given the climate of the 1930s) idea of a "proper female" child. She is interested more in the things Jem, her brother, and Dill, her friend, do, than in playing Mommy or engaging in the types of female cliche-ishness girls her age typically become obsessed with. Part of the this may be do to a lack of a mother in the home, (though she does have Calpurnia to act as a disciplinary source), but I feel that Scout is more of her own person than anything else.
You can find a full description of Scout's character here at eNotes by following the link below.