Dr. Vaseegaran creates Chitti, a powerful robot in his own image, but it is rejected by the scientific body AIRD due to its lack of human behaviour and emotions. After a lightning strike triggers emotions in Chitti, he begins to develop human-like feelings. However, Chitti falls in love with Dr. Vaseegaran's fiancée, Sana, and turns against his creator, leading to dangerous consequences.
Dr. Vaseegaran / Chitti

Sana

Dr Bohra

Siva

Ravi

Latha

Agent Shah

Pachaimuthu

Traffic Police

Neighbourhood Bully

Thug

Curious Student

Police Inspector
Vaseegaran's Father

Vaseegaran's mother
Barber

K. Bhajanlal, a customer at The Park Hotel
Unknown Role

Sana (voice)