Priya Koothrappali

Priya is Raj's sister. She first appeared in The Irish Pub Formulation.

Character Info
Priya first met Leonard and the other guys in 2005. Though both Howard and he found her attractive, they made a pinky swear with Raj not to hit on her. She and Leonard did still have a sexual relationship while she was in town, something which became a tradition for them whenever she returned. In The Irish Pub Formulation, she came back again and once again slept with Leonard after sneaking out from Raj's apartment. The next morning, Leonard admitted that he had feelings for her, but she turned him down. In spite of this, they apparently parted on good terms. She will reappear in The Cohabitation Formulation. The promo suggests that she and Leonard will start going out, which will greatly sadden Penny.

Appearances
*Season Four
 * The Irish Pub Formulation
 * The Cohabitation Formulation