Kathir is an Indian film actor who has appeared in Tamil language films. He made his breakthrough playing the lead role in Madha Yaanai Koottam (2013), before gaining critical acclaim for his performance in Kirumi (2015).
Kathir made his debut as an actor through Vikram Sukumaran's Madha Yaanai Koottam (2013), which was produced by noted music composer G. V. Prakash Kumar. The film opened to positive reviews, with Kathir earning critical acclaim for his portrayal of a village youngster. A critic from The Hindu stated Kathir "tries to do his best", while Sify.com stated he had done "a good job in his first role". Kathir then won critical acclaim for his performance in the thriller film, Kirumi (2015) directed by Anucharan and written by Manikandan. The film was also sent to international film festivals, with a critic from The Hollywood Reporter noting that "playing his namesake character, Kathir makes for a particularly avid small-time crook, effortlessly cataloging useful information for the police officers he smoothly ingratiates himself with by dint of feigned respect and subtle manipulation".
In 2017, he will be seen in the action thriller Ennodu Vilayadu alongside Bharath. He has also been cast in Vikram Vedha with R. Madhavan and Vijay Sethupathi, Pa. Ranjith's production Pariyerum Perumal and in Sigai, where he will portray an effeminate film. His next is Sathru, a crime thriller, directed by debutant Naveen Nanjundan.