Kamal Haasan

"Gunaa" Gunasekharan

Roshini

Rohini (Abirami)

Rekha

Rosy

Janagaraj

Gunaa's uncle (Chitappa)

S. P. Balasubramaniam

CBI officer Ramaiah

Girish Karnad

Doctor Ganesh

Sharat Saxena

Suresh Kumar aka S. K.

Pradeep Shakti

Ismail

Ananthu

Gunaa's cellmate

Sethu Vinayagam

Doctor

Ajay Rathnam

Inspector Moovendar

S. Varalakshmi

Manonmani

Kaaka Radhakrishnan