Nanban

Joseph Vijay

Sevarkodi Senthil: He is from a poor family with a mother as a retired teacher and a paralysed father. He was studying engineering to earn a good job and to get his sister Jaya married. Later he became a rich businessman after earning a job.

Venkat Ramakrishnan: He is an amateur wildlife photographer. He loved photography but his father wanted him to become an engineer. Later, he became a good wildlife photographer and published several books on his photographs.

Srikanth

impostor Panchavan Parivendhan (Pari) / Kosaksi Pasapugazh. He is a very intelligent student who knocked Silencer in exams, being the topper of the batch. He is always helpful. He fell in love with Ria. After graduation, he broke contact with all his friends. After a long search, his friends find him to be an entrepreneur who runs a school and is partially a teacher too.

Ria Santhanam, Virus's younger daughter, a clever and smart doctor. She was in love with Pari. (Voice dubbed by Andrea Jeremiah)

Ileana D'Cruz

Virumandi Santhanam ('Virus'): Principal of the engineering college. He is very strict and disciplined. He initially hates Pari for questioning him against his rules and discipline, but warms up to him after he helps deliver Shwetha's son. Ria and Shwetha's father.

Sathyaraj

Srivatsan alias Silencer: A topper student who was very well in all subjects. He was a little back in speaking Tamil. He too hated Pari but is shocked to find out that Pari is the very entrepreneur he is looking to sign a deal with for his company.

Swetha, Virumandi's first daughter, Ria's elder sister. (Voice dubbed by Deepa Venkat)

Anuya

Rakesh ('Pricetag'): Ria's money minded ex-fiancé.

Librarian Bose

Mrs. Ramakrishnan, Venkat's mother, a loving and caring parent.