Antonio, a skeptical child living in Chimney Town, initially challenges the protagonist’s belief in stars beyond the smog-choked sky. He accuses Poupelle—a scavenger whose landfill odor he blames for spreading asthma among residents—of endangering the town, sparking a clash that sends Poupelle tumbling into a lake. Over time, Antonio shifts from opposition to alliance, aiding the protagonist’s crew in freeing a ship essential to clearing the smoke veil. His actions help catalyze the final push to unveil the hidden stars, completing his journey from adversary to collaborator.