Naji lives with his grandfather amid the ruins of Trade City E-05's West Gate, a situation resulting from his parents' loss in an incident five years before the main story. His existence is deeply shaped by the post-apocalyptic world.

Physically around nine years old, he has short hair described as brown or black and brown or black eyes. He typically wears plain clothing, a white bandana, and sometimes a vest. Notably, he occasionally dons a costume mimicking the dangerous insects of his world, using this disguise to frighten others away as a likely survival tactic.

Despite the harsh slum environment, Naji maintains a kind disposition and persistent positivity. He demonstrates this resilience by comforting Ilie during her distress. While acknowledging the insects have "taken everything," he counters this devastation by observing the sunset's enduring beauty, symbolizing hope and aspects beyond the creatures' reach. His experiences have fostered a survival-focused realism unusual for his age.

For practical support, he undertakes repair work on hardware, assignments given by the soldier Qasim. This provides a means to contribute within his community. His interactions extend beyond labor, forming connections like the moment with Ilie. His relationship with his grandfather remains foundational to his daily life in the ruins.