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Vikram as Ramanujam 'Ambi' Iyengar / Remo / Anniyan |
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Sadha as Nandini Raghuram |
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Prakash Raj as DCP Prabhakar |
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Vivek as Chari Singari |
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Nedumudi Venu as Parthasarathy Iyengar |
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Nassar as Psychiatrist |
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Cochin Haneefa as Delinquent Car Owner |
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Kalabhavan Mani as House Owner |
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Charle as Wastrel |
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Shanmugarajan as Chockalingam |
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Saurabh Shukla as Break Company Owner |
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Manobala as Ticket Conductor |
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Shanthi Williams as Susheela, Ambi's Mother |
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R. Neelakantan as Ananthanarayanan |
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Sriranjini as Nandhini's Mother |
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Vatsala Rajagopal as Ambi's Grandmother |
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Mohan Vaidya as Krishna |
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Hari Prashanth as Young Ambi |
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Citizen Mani as A cook who works under Chockalingam |
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Yana Gupta as Special Appearance in "Kaadhal Yaanai" Song |
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Kaniha as Nandini Raghuram (Voice) |
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S. N. Surendar as Parthasarathy Iyengar (Voice) |
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Meera Krishnan as Nandhini's Mother (Voice) |
| Writing | Kabilan | Lyricist |
| Sound | Harini | Playback Singer |
| Sound | Lesle Lewis | Playback Singer |
| Sound | Shankar Mahadevan | Playback Singer |
| Sound | KK | Playback Singer |
| Sound | Shreya Ghoshal | Playback Singer |
| Sound | Vasundhara Das | Playback Singer |
| Sound | Hariharan | Playback Singer |
| Writing | Vairamuthu | Lyricist |
| Sound | Sunitha Sarathy | Playback Singer |
| Sound | Jassie Gift | Playback Singer |
| Sound | Nakul | Playback Singer |
| Sound | G. V. Prakash Kumar | Playback Singer |
| Production | V. Ravichandran | Producer |
| Directing | Shankar | Director |
| Writing | Sujatha Rangarajan | Writer |
| Camera | V. Manikandan | Director of Photography |
| Camera | Ravi Varman | Director of Photography |
| Writing | Shankar | Screenplay |
| Writing | Sujatha Rangarajan | Dialogue |
| Art | Sabu Cyril | Art Direction |
| Writing | Shankar | Story |
| Crew | Ahmed Khan | Choreographer |
| Crew | Raju Sundaram | Choreographer |
| Sound | AS Laxmi Narayanan | Sound Mixer |
| Crew | Peter Hein | Stunts Coordinator |
| Sound | Harris Jayaraj | Original Music Composer |
| Sound | Andrea Jeremiah | Playback Singer |
| Sound | Saindhavi Prakash | Playback Singer |
| Crew | Kalyan Kumar | Choreographer |
| Writing | Na. Muthu Kumar | Lyricist |
