Anniyan

Ambi is a principled consumer protection advocate whose faith in the law is eroded by corruption. His suppressed anger manifests as three personas—Remo, a metrosexual alter ego, and Anniyan, a grim-reaper vigilante—each serving different aims. A childhood trauma surrounding his sister Vidya's death fuels his crusade for accountability. The arrival of Nandini and a path to therapy forces a reckoning between his ideals and violence.

Nandini is an aspiring Carnatic singer and Ambi's neighbor who is drawn to Remo before rejecting Ambi for his overbearing nature. She later becomes involved with Remo, and after Remo's arc ends, reciprocates Ambi's feelings, helping to anchor his reform. Her choices drive the central romantic arc and influence Ambi's path toward marriage.

A determined police officer who pursues Anniyan's murders and aims to bring him to justice. He suspects Ambi, conducts intense investigations, and ultimately tortures him during interrogation, blurring the line between law enforcement and coercive power. His clashes with Ambi highlight tensions between due process and vigilantism.

Ambi's loyal friend and ally who offers support and helps in orchestrating plans, including the Tyagaraja Aradhana-based proposal to Nandini. He also records critical evidence during trials, underscoring his role as a practical, trustworthy conspirator and witness.

An errant catering contractor for Indian Railways whose corruption and negligence become a target for Anniyan's punishments. His death marks one of the publicized acts of private justice that spark debate about accountability.

The voice of Nandini's mother, providing a maternal perspective amidst the romantic and societal pressures surrounding Nandini and Ambi. Her role helps ground the narrative's emotional stakes.