Arjunan is an Indian actor known for his supporting roles in predominantly Tamil-language films. He made a breakthrough as Siva, a hopeless romantic college student, in Balaji Mohan's bilingual film, Kadhalil Sodhappuvadhu Yeppadi (2012), receiving critical acclaim for his portrayal.
Arjunan made his breakthrough with Balaji Mohan's romantic comedy Kadhalil Sodhappuvadhu Yeppadi portraying Siddharth's friend, a hopeless romantic. The film, a remake of a short film by the director, which Arjunan also featured in saw him double up duty as an assistant director. A critic from The Hindu noted "despite appearing gawky and untrained as an actors", he "makes that up by being natural and uninhibited." After winning good reviews, he went on to feature in Siddharth's next Telugu film Jabardasth (2013) and then played a supporting role in Suseendran's Aadhalal Kadhal Seiveer (2013), where a critic praised his contribution, writing he "ensures some laughs even in the most serious scenes." Arjunan next played a supporting role in Balaji Mohans's following bilingual film, Vaayai Moodi Pesavum (2014).
Arjunan has twin children: son Ilan and daughter Iyal, both of whom are child actors.