Dharmathin Thalaivan

Raju is Balu's younger brother, a short-tempered and rowdy student who is spoiled by Balu and Sumathi. After Balu's death, he vows to reform, moves with Sumathi to Bangalore, and begins working at Devi's garage, ultimately marrying Devi. His arc centers on restraint, responsibility, and protection of his loved ones.

A kind-hearted but absent-minded college professor who tries to reform his brother. He dies while intervening in a fight, and before dying asks Raju to ensure Sumathi can remarry and be cared for. His death becomes the catalyst for the film's emotional journey.

Balu's cousin and love interest who is devastated by his death and dons widow's garb. She later reconciles with Shankar and ultimately marries him, while also being part of the emotional arc that tests loyalty and love.

Raju's doppelgänger who initially lives as a rowdy thief stealing cars. After hearing the siblings' story, he reforms, becomes a police informer, falls in love with Sumathi, and eventually marries her, even disguising himself as Balu for the wedding.

A ruthless diamond smuggler who kidnaps Sumathi and resists the heroes' quest for rescue. He is confronted and ultimately arrested in a climactic confrontation, reinforcing the film's criminal-justice arc.

Owner of the garage where Raju works; she offers him employment and becomes a partner in the new life he builds after moving to Bangalore. Their relationship culminates in marriage at the end.

A college student whose father owns the college and who clashes with Raju. His rivalry and conflicts help set the stage for the film's central tensions and the drama surrounding the college.