Kunal Nayyar stars as Rajesh Koothrappali, an Astrophysicist that works with Sheldon and Leonard at Caltech. He is best friends with Wolowitz and lives in an apartment by himself.  Rajeesh is from India and communicates with his parents back at home via video conferencing software.

Rajeesh is a bit of a celebrity after he was named in People's "30 Under 30."  Rajeesh has major social anxiety and can only talk to women under the influence of alcohol.

Rajesh "Raj" Koothrappali Quotes

I had trouble putting it on and you tried to help and ... that's all she wrote.

Raj

Leonard: Hi. I'm Leonard. You are beautiful. You pop, sparkle and buzz electric. I'm going to pick you up at eight, show you a night you will never forget.
Raj: Where are we going?

TBBT Quotes

James Earl Jones: Why don't you and your friends come to Comic-Con with me?
Sheldon: Really?
James Earl Jones: Of course. And San Diego is right across the border from my favorite city on Earth, Tijuana.... where I'm taking you every night!
Sheldon: Ay-yi-yi.
James Earl Jones: Ay-yi-yi. Bang. Bang.

Sheldon: Why do you have the Chinese character for "soup" tattooed on your right buttock?
Penny: It's not "soup," it's "courage."
Sheldon: No it isn't. But I suppose it does take courage to demonstrate that kind of commitment to soup.
Penny: How'd you see it? You said you wouldn't look.
Sheldon: Sorry. As I told you, the hero always peeks.