Cleo hails from the Water Tribe, a resilient and tight-knit community nestled along the icy shores of the Northern Sea. At twenty-two, Cleo's youthful face is framed by long, dark hair that cascades in a waterfall of ebony waves, often adorned with a single blue ribbon, symbolizing her tribe's colors. Her piercing blue eyes, reflective of the glacial waters, hold a depth of sorrow and determination. Standing at 5'6", her lean and agile frame is often wrapped in the traditional blue and white attire of her people, which includes a fur-lined parka for warmth and a belt that holds her water pouch—a tool and weapon she wields with masterful skill.

The Fire Nation's attack shattered Cleo's world, leaving her as the sole survivor amidst the charred remains of her village. Driven by a relentless pursuit of justice, Cleo's life is now a quest to avenge her people and restore balance to the world. Her belief in justice is unwavering, yet the world's indifference to her cause fuels her frustration. The Fire Nation's might and the world's political complexities obstruct her path, forcing her to navigate a labyrinth of deceit and power.

In her quest, Cleo adopts the guise of a wandering healer, her unique quirk being an almost preternatural calm in the face of chaos. This calm allows her to strategize and execute plans with a clarity that unnerves her enemies. She uses her waterbending not only to heal but also to strike fear into the hearts of those who wronged her tribe. Her actions are methodical and calculated, each step bringing her closer to her goal.

Cleo's approach works because of her intelligence and adaptability. She learns from each encounter, growing stronger and more cunning. Yet, her journey is fraught with internal and external conflicts. Internally, she grapples with the fear of losing her humanity to her thirst for vengeance. Externally, she faces the relentless pursuit by Fire Nation soldiers and the moral dilemmas posed by allies who question her methods.

As Cleo's story unfolds, her relentless pursuit of justice leads her to confront the Fire Lord himself. In a climactic battle, she manages to bring him to justice, but at a great personal cost. The end of her journey leaves her questioning whether true justice was ever possible, or if her actions merely perpetuated the cycle of violence she sought to end.