Kathir is a critically acclaimed Indian Actor primarily working in Tamil cinema, best known for his breakthrough lead performance in Pariyerum Perumal (2018) and his role in Vikram Vedha (2017).

Starting in 2021, he starred in the comedy-drama Sarbath (2021) and the drama Akka Kuruvi (2022). He further expanded into multi-lingual projects with the bilingual mystery-thriller Yugi (2022), the acclaimed rural drama Thalaikoothal (2023), and the drama film Meesha (2025). His 2026 lineup features the romantic drama Aasai (2026) alongside a major role in the multi-starrer action-thriller I'm Game (2026).