Sheldon Cooper: Sheldon is a scientist who has devoted his life to science since child, achieving amazing results thanks to their high intelligence. Sheldon has two doctorates and a master with working as a theoretical physicist at the California Institute of Technology with his fellow Howard, Raj and Leoanard, who shares housing.
Leonard Leonard worked as an experimental physicist at the California Institute of Technology, to share apartment with Sheldon Cooper. The son of a cold neurologist and psychiatrist (who gets along very well with Sheldon, as they have the same personality) and an anthropologist. It is in love with his neighbor Penny.
Howard: He works as a mechanical engineer , to have a master who won at MIT, and often spends time with his friends Leonard Hofstadter, Sheldon Cooper and Raj in the apartment of the first two. Howard is a young Jewish man who still lives with his mother and tries, and his girlfriend is bernabette.
Raj: Raj as you know, is an expert in particle astrophysics. He discovered a new planet beyond the Kuiper belt, which he called "Planet Bollywood" (in reference to Hollywood Indian), earning him appear in People magazine. Raj was born in India and frequently communicates with his parents on the Internet, who constantly led him to have relationships with women
Penny: Penny is the main female character of the series. Is the neighbor across from Leonard Hofstadter and Sheldon Cooper and is the primary love interest of Leonard.
Amy: Amy Fowler is a neuroscientist that Raj and Howard found for Sheldon through an internet dating service (without their knowledge). Sheldon is more like any other person. Like this, there have previously avoided relationships.
Benadette: Bernadette invites Penny out with Leonard and a friend of this. In the beginning of the appointment, when will the four in the car, it seems that she and Howard have nothing in common: She does not like science fiction, magic tricks, , no computers. But when you are in the restaurant both start complaining of their difficult relationships with their mothers.
