He is also active in the Sri Lankan film industry, theatre and television as a screenwriter, director and actor.
[citation needed] He has acted in the television serials such as: Kodi Gaha Yata, Sahodaraya, Koombiyo, A/L Iwarai and Eka Langa Kotu.
[11] On 28 April 2024, he was accidentally shot during a shoot at the film set of Father directed by Chaminda Jayasuriya.
[12] In March 2022, Manuwarna along with Lahiru Weerasekera, Rathindu Senaratne, Dhammika Munasinghe, Venerable Rathkarawwe Jinarathana Thero, Eranga Gunasekera, and Jehan Appuhamy were surrendered to the Maradana Police via counsel after an illegal assembly opposite.
[13] In November 2024, he contested for the 2024 Sri Lankan parliamentary election from Kandy district as a member of the National People's Power.