Koothara

A middle-class engineering student who dreams of a motorcycle and a life beyond routine exams. He seeks thrills in college through flings and keeps the trio's energy alive. His path shifts when Sheistha betrays him at a college festival, leading to expulsion and a forced detour toward seminary before the sea becomes his true stage.

From a financially strained background, Tharun carries family pressure and a sense of responsibility. He is more grounded, pursuing painting while his friends chase easier paths, and he becomes the one who hints at a past affair with Swathi. He matures through the Yellowtooth crisis and the AK47 voyage, finding a new purpose.

The wealthier member who drifts through engineering with little enthusiasm, facing belittlement at home. He tries a string of jobs after college, failing to settle, until he marries Shilpa at the story's end, marking a turn toward commitment and stability.

A stabilizing neighbor and single mother who becomes a touchstone for the trio amid chaos. She supports them during Yellowtooth's collapse and enters a complex relationship with Tharun, eventually influencing the circle's dynamics as marriages form.

A shop worker who captivates Ram and anchors a key relationship arc. Her presence helps ground the group's chaotic energy and leads toward a hopeful future as life advances.

A cunning fisherman leader who orchestrates the AK47 scheme and traps the trio into buying a dangerous boat. He later reveals his vendetta, becoming the principal adversary in their sea-based trials.

Koobrin's relationship with Roshni begins during college; she becomes a supportive figure in his life and remains part of the evolving circle as the story progresses.

A laid-back professor who offers shelter to the trio after hostel life ends, serving as a quiet, supportive mentor during a turbulent period.

The loyal dog who travels with the trio and serves as a quiet observer and occasional narrator, adding warmth and continuity to the story.

Koobrin's last conquest during the college festival, whose betrayal triggers the group's expulsion and tests their endurance and forgiveness.