Kunal Nayyar's character, Raj Koothrappali, has always been a favorite among fans of . His awkwardness and introverted nature made him relatable to many viewers. Raj's struggle with talking to women without alcohol was a running gag that eventually saw him grow more confident over the series.
Issabella, played by Maria Canals-Barrera, was introduced as a janitor at Caltech, where Raj worked.
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