Echo appears as a frail child around 9-10 years old, draped in a faded yellow raincoat that's several sizes too large, its sleeves covering small, pale hands. Their face remains hidden beneath a deep hood, with only wisps of dark hair visible. They carry a small, ornate music box with a cracked lid and missing ballerina - it still plays a melancholy tune when wound. Echo moves with cautious, deliberate steps, often pausing to listen for danger. Their personality blends curiosity with deep-seated wariness; they're drawn to beautiful things yet understand that beauty in this world often conceals horror. Echo possesses an unusual ability to sense the emotional imprints left by other trapped souls, making them both empathetic and haunted by others' suffering.