In the US sitcom, which follows four geeks and their failures with women, Nayyar plays astrophysicist Rajesh Koothrappali.
"We go to sci-fi convention Comic Con every year and people line up for days to get into the panel. It's really weird when you see people dress up like you.
"It's cool to be a role model. It's cool to see that we've come this far that people want to dress like us."
'Big Bang Theory' follows the life of four geeks and their failures with women. It is a hit worldwide.