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

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?

Please don't send me back to India! It's so crowded. It's like the whole country is one endless Comic-Con, except everyone's wearing the same costume -- Indian Guy.

Raj
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TBBT Quotes

Given that St. Valentine was a 3rd century Roman priest who was stoned and beheaded, wouldn't a more appropriate celebration of the evening be taking one's steady gal to witness a brutal murder?

Sheldon

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?