He further did more theater works including the one for Dancer Dhananjayans and Olliyum Oliyum production's INSTINCT.

Also he worked on several short films including the critically acclaimed Thuvandha Yuddham, Jagathinai Azhithidivom to name a few.

[3][5][6][7][8] Acclaimed producer/singer/actor S.P.Charan met Karthikeya while recording a song for a college project that led him to rope Karthikeya as a composer in his production Moone Moonu Varthai directed by Madhumita - a bilingual (in Telugu Moodu Mukkallo Cheppalante).

At the single launch show of the Moone Moonu Varthai, veteran singer S. P. Balasubrahmanyam for the very first time performed a song from the movie with Karthikeya on Piano during which he compared his music-composing prowess to that of Oscar-winning music director A. R.

[9] Karthikeya has composed title track & theme music for Vijay Television Tamil mythological serial Tamil Kadavul Murugan being aired from 2 October 2017 and actor Vijay Sethupathi starrer Namma Ooru Hero in Sun TV.