It's none other than Tina Dutta. She is using Sam, dham, dand, bedh scheme to be here. This lady is not playing with the contestants but with the makers and bb too. The way she took shalin into her side with witchcraft and the way she made Sumbul sautan was remarkably well executed.
She is playing so cunning that none can say that she is even playing the games. The way she asked for validation from bb regarding her character assissnation, the way she play colors face card , her jealousy everything is visible. She is the antagonist of this show in bb history.
She was playing duo game at first, but then she realised that her character is getting ruined after being linked in Sumbul and Sha matter. She quickly made alliance with Shiv team.