Nadu Iravil

Initially portrayed as a crippled, blind young man, Jambu manipulates others with a hidden identity. He is the mastermind behind the murders, driven by greed to inherit Dhayanandam’s wealth. His deceitful nature is central to the story's climax, revealing a calculated and ruthless personality.

Ponni is Dhayanandam's mentally ill wife, whose presence heightens the sense of mystery. Despite her mental illness, she is a victim, and her tragic death underscores the film's exploration of innocence and vulnerability. She is also a key figure that contributes to the tension among the family members.

Ragini is Jambu's nurse who is falsely presented as his daughter. She is innocent and unaware of the true motives behind the murders. Her role is crucial in unmasking Jambu’s deception and revealing the real antagonist, embodying trust and misplaced innocence.

A wealthy old man terminally ill, Dhayanandam's illness and decision to bring his siblings together create a tense atmosphere. His suspicion and decision to delay distributing his wealth reflect his mistrust and concern for justice amidst chaos. He acts as the story's moral compass, driven by familial conflict and suspicion.

The family doctor and key figure suspected at various points, he is presented as a calm, rational character. His role becomes pivotal when his true identity is revealed, exposing the layers of deception and the lengths to which characters are willing to go for inheritance. His presence embodies medical authority and suspicion.