Gaara is the person with lonely and never trust anybody. In his mind, he want to kill everybody and only trust himself.

Like Naruto, he also have monster inside him, an evil spirit. There for he is dangerous person. However after fight with Naruto and Naruto friends, he have learn something. Now he know Naruto also orpan like him. However Naruto have change Gaara mind set with by tell him about how important to have a friends and the meaning of sacrifies. Now he protect hi village and became a hokage