Given below are details of the Antagonists and the Characters they play in the MTV Show Kaisi Yeh Yaariaan.

Kishwar Merchant as Nyonika Malhotra

Kishwar Merchant plays the character of Nyonika Malhotra in Kaisi Yeh Yaariyaan. She is a shrewd Business Woman and Manik's mother. She turns the negative publicity of a ragging incident to positive publicity by offering scholarship to Nandini and Navya after they save a Guy from committing suicide. The character of Nyonika is similar to that of Kang Hee Soo, the main antagonist in the Boys Over Flower k-drama television series portrayed by Lee Hye-young.

Harshad Saxena real name Abhishek Malik Kaisi Yeh Yaariyan Cast

Abhishek Malik as Harshad Saxena

Abhishek Malik played the role of Harshad Saxena in Kaisi yeh Yaariyan. He is Alya’s Brother and Mukti's Ex Boyfriend. He is quite a charmer and knows the art of attracting women. He stands up against FAB5 when they torture Nandhini and Navya. Harshad is a vocalist and forms the music band NH3 along with Nandini, Navya and Shahid. Navya falls for him and blindly trusts him. In his hated for Manik, he manages to harm him but was trapped by the FAB5 and send behind bars. Harshad is refused bail after Navya  testifies against him. Harshad dumps Navya after he finds her of no use to him. However, for the sake of Alia, the FAB5 withdraws the case against him. Navya becomes pregnant but he refuses to take responsibility and vanishes after Alia speaks harshly with him. The character of Harshad is said to be returning soon.
Abhishek Malik was previously seen in the Colors TV Serial Chhal-Sheh Aur Maat, Sony TV Show Dil Ki Nazar Se Khoobsurat and Zee TV Show Punar Vivah - Ek Nayi Umeed. He was the runner up of SplitsVilla - 7.

Dishank Arora as Pandit Trilok Chaurasya

Dishank Arora plays the role of  a young Pandit who comes to the Space Academy to take a workshop on Indian Classical Music. He is given the responsibility of organizing a Fusion Concert. Mr Khurana introduces his character as TK to the Principal. The initial episodes of Kaisi Yeh Yaariyaan showed him as a strict teacher who values time and discipline. However, the recent episodes revealed him as an Antagonist who has evil intentions on Nandini. Dishank Arora was previously seen in Serials like Love Ne Milla Di Jodi, Punar Vivah, Sapnon Se Bhare Naina, Ek Boond Ishq and Do Dil Bandhe Ek Dori Se.Check out Dishank Arora Interview.
Soha Khurana Kaisi Yeh Yaariyan real name Jasmine Avasia

Jasmine Avasia as Soha

Jasmine Avasia played the role of Q Label Owner Mr Khurana's daughter who considers herself as the craziest fan of Manik and tries to get closer to him. Manik also intentionally uses Soha to make Nandini jealous so that she comes back to him. In the later episodes Soha is shown as mentally unstable. Soha's obsession for Manik develops to such an extend that she tries to kill Nandini many times. In an effort to kill Nandini, Soha falls into the fire and gets burned. Her character is shown as alive despite of suffering severe burns. However, Soha Khurana was declared as dead by Mr Khurana and Manik is send to jail for killing her on the insistence of Nyonika for personal gains.
Jasmine Avasia was MTV Splitsvilla 5 contestant and was last seen as Ria in the Life OK show Tumhari Pakhi. Check out Jasmine Avasia Interview