Ratsasan

An ambitious sub-inspector who loves psychopaths and aspires to make a film about them. He pushes beyond protocol to chase a serial killer, risking his career and safety. His relentless drive and protective instinct for Ammu push the investigation forward, even as personal costs mount.

Ammu’s mother, a protective and supportive figure who anchors the family amid tragedy. Her quiet resilience contrasts with the chaos of the case. She is drawn into the dangers confronting her daughter and her sister’s household.

Arun and Kokila’s daughter, a bright student whose abduction becomes the mission's emotional core. Her case drives Arun to take extraordinary risks. Her presence embodies innocence amid a brutal investigation.

CI Doss is Arun’s brother-in-law, a loyal, practical ally who offers support and street-smarts. He helps keep the investigation grounded while dealing with his own family concerns.

Vijayalakshmi, Ammu’s teacher, who becomes an ally to Arun as he follows leads. Her professional calm aids navigation of school environments and victim contexts. She provides protective, compassionate support during the case.

Ammu’s hearing-impaired niece, a symbol of vulnerability and resilience. Kayal highlights communication challenges and the vulnerability of children, while motivating Arun to solve the case.

A hearing-impaired girl who becomes a murder victim, reinforcing the serial killer’s pattern and heightening the stakes for investigators and families.

A gifted pianist and magician with Werner syndrome who becomes the film’s primary killer. He adopts multiple identities as part of his crime spree, masking his true motive behind entertainment. His backstory shows how childhood pain and social rejection can fuse into violence.

A retired police officer who hints at the killer’s identity and warns Arun. He provides crucial historical context about the suspect’s past and dies before revealing the full truth.

A pathologist who confirms the serial killer’s modus operandi and links the victims through autopsy analysis. His forensic insight grounds the case and he becomes a casualty as the killer escalates.

A police officer who supports Arun’s investigation and becomes a casualty of the killer’s spree, marking a turning point in the pursuit.

A pedophile teacher who is caught and confesses to abuse, linking to the killer’s broader pattern. He dies in a confrontation, accelerating Arun’s unofficial investigation.

A victim who befriended Christopher in childhood; her rejection fuels his rage. She embodies the human costs of his fixation and helps reveal his past identity.

An elderly house owner who observes neighborhood dynamics and aids the investigation with practical information, highlighting how ordinary people witness extraordinary crime.

The younger version of Christopher who experiences humiliation and neglect, foreshadowing the killer’s later violence and showing how childhood hurts can seed a predator.

A supporting community member whose presence adds texture to the investigative milieu, contributing to the film’s local realism.

Senior Police Officer who oversees the investigation and provides an institutional perspective. His leadership frames the procedural aspects of the case.