Sivakarthikeyan is an Indian film actor, comedian, and playback singer best known for his Tamil films. He began his career as a dancer and television personality at STAR Vijay, initially participating in reality shows, including the stand-up comedy show Kalakka Povathu Yaaru and the dance competition show Jodi Number One. He later went on to become a recurring host of those shows, especially the popular Athu Ithu Ethu, and many other STAR Vijayshows for multiple seasons until shortly after he made his acting debut in Marina (2012), 3 (2012), and Manam Kothi Paravai (2012). He went on to performing lead roles in other acclaimed films, such as Ethir Neechal (2013), Varuthapadatha Valibar Sangam (2013), Maan Karate (2014), Kaaki Sattai (2015) Rajini Murugan and Remo (both 2016).
During his college days he took part in various cultural event and performed mimicry and standup comedy on stage. Between his studies he took three months break and during this period his friends convinced him to go for auditions of Kalakka Povathu Yaaru, a reality show for comedy aired on Star Vijay. Despite initial reluctance to participate, he won the show. He then continued his television appearances by participating in dance-reality shows, pairing up with Aishwarya Prabhakar in Jodi Number One Season 3 and then in Boys Vs Girls Season 1 and 2.
Sivakarthikeyan became well known for his light-hearted trolls and mockery of co-hosts and participants in shows, as well as his impersonations of several film actors, especially Rajinikanth. He received further opportunities to host several shows on Star Vijay like Airtel Super Singer and Jodi Number One Season 5. He hosted the special edition of a popular talk show, Koffee with Siva, after Koffee with Anu had discontinued due to Anu Haasan‘s retirement. However it was his game show, Athu Ithu Ethu that made him reach a wide range of audience. He got opportunities to host promotional film events as well as the 5th and 6th editions of the Vijay Awards. He regularly appeared in short films including his friend Atlee’s Mugapputhagam, Identity, Kurahl 786 and 360°, while balancing his career as a television host.