“Buzz, like many characters in Toy Story, is a complicated one, who feels genuine emotions such as pride, anger, depression, and sadness, much like a regular human. These are traits which he shares with his best friend, Woody, however, one would say that Buzz is better at keeping his emotions in check than the cowboy. Buzz is known for his bravery and courage with a by the book mindset, believing the way people should live their life by the following rules; though there are rare moments when he will bend the rules or tell a cover story if needed to when he knows it is the right thing to do.”
Source: http://disney.wikia.com/wiki/Buzz_Lightyear