The Big Bang Theory is an American comedy , are a group of friends who work at the university, all working in a different field , but have in common that they are all " geeks ." They are all together all day at the house of Leonard And Sheldon, they have a neighbor that is called Penny and what is the opposite them, but still tries to have a relationship with Leonard .

Characters :

- Leonard : He is a man of medium height , brown hair , wears glasses , is less " geek ."

He is a physicist who works at Caltech and fellow apartment in Sheldon . His research often include the use of lasers and are quite varied topics , such as Bose -Einstein or cosmic rays . Master mathematics and physics , but also has great knowledge of literature and history. He likes being with his friends but sometimes being too shy freak and try to be more social with other people .

In Leonard seems the most " normal" of the group.

Sheldon : It's a tall , short brown hair , not wearing glasses , is the freak .

Despite being the best friend of Leonard , his character is very different. Fully proud to be a genius  totally dedicated to science , but has an obsessive-compulsive disorder . Sure of his superiority and increase his ego tends to question the theories and work of their peers. Many people say that is crazy , but always says that it is because her mother did tests. On the other hand, has a great sense of ethics and morality, but no sense of humor and does not understand sarcasm . It's very methodical , has some quirks and habits that are unquestionable . It is not very sociable .

Penny : Waitress restaurant chain The Cheesecake Factory and new neighbor , Leonard and Sheldon . A girl is very pretty , friendly, open and nice , but on the other hand is also a very ignorant, very messy and very unintelligent . He says he is vegetarian , although she loves to eat fish and steak . When a relationship breaks up , usually meaningless sex during the following weekend, but then says he feels terrible .

Howard: is a man of medium height , has brown hair and hair quite short , like a " mushroom " not wearing glasses .

A girl is very pretty , friendly, open and nice , but on the other hand is also a very ignorant, very messy and very unintelligent . He says he is vegetarian , although she loves to eat fish and steak . When a relationship breaks up , usually meaningless sex during the following weekend, but then says he feels terrible .

Rajesh: is an indian character, his hair is brown , brown eyes, he have a “beca” in the universty and reserch a project, he have a sister and his family live in india, he is happy, funny and he is joke. He is medium hight.

Bernadet:

characters in the show who can control Sheldon, mostly because of her knowledge in dealing with stubborn children. She is generally a friendly and good-natured individual, quickly making friends with Penny and Amy, as well as the rest of the gang, but occasionally shows signs of mania, most notably when she got into a fight with Amy over a parking space Sheldon and Howard were fighting over, and when she explains her interest in microbiology as being because she feels like a God to the bacteria she is studying.

Amy Farrah:

They ended their friendship with sheldon when they got into an argument over whose field of study was superioThe two initially communicate online and via webcam, but at the encouragement of the group, she starts hanging out with the gang in person. In Season Five, after Amy went out on a date with comic book store owner Stuart, Sheldon decided to solidify their relationship as boyfriend/girlfriend withRelationship . Amy began a campaign in "The Launch Acceleration" to increase Sheldon's feelings for her by becoming more involved in his interests like video games and Star Trek, and treating him as his mother had. During Howard and Bernadette's wedding ceremony, Amy is disappointed when Sheldon says that he hopes that the two of them are as happy together as he is alone. Later as Howard is launched into space