Kathir is an Indian actor who appears in Tamil language films. He made his breakthrough by playing the lead role in Madha Yaanai Koottam (2013) and gained critical acclaim for his performance in Kirumi (2015), Vikram Vedha (2017), Pariyerum Perumal (2018) and Sigai (2019). In 2022, he starred in the Prime Video thriller series Suzhal: The Vortex.

Madha Yaanai Koottam is a 2013 Indian Tamil language thriller drama film written and directed by Vikram Sugumaran, a former assistant of Balu Mahendra and dialogue writer of Aadukalam. It was dubbed into Hindi as Ravanpur. The film is produced by G. V. Prakash Kumar stars, newcomer Kathir, along with Oviya. The film's soundtrack and background score were composed by N. R. Raghunanthan. The film was a sleeper hit at the box office.