This question has been answered by psawyer previously
Originally posted by psawyer
Sasha is Deven Garg & Garima Garg's son, meaning Shruti's second cousin. He & his family (Garima, his brothers Machan, Rob and sister Neel) arrived to claim the property that their grandfather (Babuji's estranged brother) had supposedly left for them. Sasha was in love with Gunn, whom he knew from their college days, but she fell in love with and married Krishna.
Sasha started annoying the family, esp. Parvati (he had this thing where he would mockingly call her "Parvati.................Aunty" leaving a huge gap between the two words). He played a game of cards with Krishna in which he won the AG House, their money and business and also one night with Gunn, whom Krishna had stupidly bet. Angry with Krishna and wanting to teach him a lesson, Gunn went with Sasha that night but nothing happened between them...this however always made Krishna insecure.
He even joined hands with Aryan at one point, after Aryan and Shruti had separated, and Aryan had become evil.
Sasha's brother Machan killed Aryan's sister Manya, and the blame went on Krishna and then Shruti (who took the blame on her head when she thought Krishna was the killer). Parvati sent Machan to jail eventually.
Sasha found love with a girl called Monica, who always begged him to change his ways before it was too late.
Then the Mahabharata started between Sasha & Parvati, Shruti, Monalika and Gunn. After minor triumphs and defeats either way, Sasha hatched a plan to kill Om at a party, but instead the shooter accidentally shot Monica, who died. Sasha couldn't bear this grief and was carted off to a mental asylum.
Later he came out of there and joined hands with Pallavi. He kidnapped Shruti, and later pretended to be good and gave the AGs their house back after Gaurav had sold it to Pallavi. But his track sort of disappeared when the whole Suyash-Trishna-Paro track started.
His trademarks were "Kill me..." and "Parvati.........Aunty". He got slapped countless times for that last catchphrase