Antonio, a traveling merchant and hawker, forms a professional partnership and friendship with William on the journey to Whitesails. He excels at trade and negotiation, applying his deep knowledge of business to forge mutually beneficial arrangements. His approach centers on identifying people's needs and offering fair compensation for goods or services, embodying his philosophy that commerce should fulfill desires through equitable transactions. Despite significant setbacks, including the failure of his previous trading company due to repeated ship sinkings, Antonio maintains an optimistic outlook. This resilience sustains him as an independent merchant, though the misfortunes earn him occasional teasing from companions like Robina Goodfellow. His practical skills in managing supplies and generating income prove vital to William's group during their travels. Within the party, he collaborates effectively with Robina, using her musical performances to draw potential customers to his merchandise. This partnership thrives in villages where William's freely offered healing, acts of goodwill toward Gracefeel, indirectly boosts sales by fostering community trust. Antonio's conversations with William reveal his thoughtful perspective, prompting the healer to consider personal aspirations beyond divine obligations. His demeanor projects peacefulness and approachability, putting others at ease despite William's intimidating capabilities. These traits, combined with his negotiation skills, establish him as a trusted confidant. He accompanies the group to Whitesails, a strategically important city for southward expansion where political developments unfold; his specific activities there remain undocumented.