Howard Wolowitz is the product of an overbearing Jewish mother who still treats him like a child. Unlike his nerd buddies, he lacks a PhD, although he holds a master´s degree in engineering from MIT. He fancies himself a ladies´ man, but can´t see how his creepy overtures send the fairer sex running the other way.
Rajesh Koothrappali is one lovable paradox. He´s a New Delhi native who dislikes Indian food and culture. He´s a lonely, preening metrosexual who used to be unable to speak to women, unless he was drunk. He pleads poverty, but actually comes from a wealthy family.