Batman is a dark and brooding hero with a personal vendetta against crime and injustice. Psychologically traumatized after witnessing the death of his parents, Batman has sworn to rid Gotham from the criminal elements that took his parents from him. He is extremely pessimistic and suspicious, which often makes it difficult for him to trust people other than Alfred, Commissioner Gordon, the Robins or the Batgirls. Despite this, Batman has proved to have a great love for humanity, which was instilled by his parents. Indeed, Batman’s oath of vengeance is tempered with the greater ideal of justice. He refrains from killing, as he feels this would not make him any better than the criminals he fights.