At first, Jack seems rather cold and distant, not relying on the help of others and claiming to be able to handle things alone. Jack also has a strong sense of justice. Jack has been shown to care for those he considers his friends, even though he'll often give a different reason to his actions. Once someone earns Jack's respect, he'll do anything within his capabilities to earn that person's respect back, and also help them in any way he can. He's also rather intelligent and observant.