Aarti Mann (Priya Koothrappali)
Raj’s little sister, Priya, is a law student who made her first appearance on the show in the fourth season. Unbeknownst to everyone in the group, she and Leonard start dating, but Raj learns of this, and things went south pretty quickly after that.
It was clear that while he was dating Priya, Leonard was still infatuated with his neighbor across the hall. Priya gives him an ultimatum: either he cuts all contact with Penny or their relationship is over. In the end, her parents force her to return to India after discovering her secret. They attempt and fail to have a long-distance relationship.