Zachariah's contribution to the novel "Poor Christ of Bomba" is significant.

He serves as a mentor and guide to the protagonist, Ngu, helping him navigate the complexities of life in the village of Bomba. Zachariah is a wise and compassionate figure who imparts valuable lessons about faith, resilience, and the importance of community. He also plays a crucial role in shaping Ngu's understanding of Christianity and its relevance to their lives in Bomba. Overall, Zachariah's presence in the novel adds depth and richness to the story, highlighting the importance of spiritual guidance and moral support in times of hardship.

While the character of Zachariah does appear in the novel "Poor Christ of Bomba," his contribution to the plot and themes of the novel is relatively minor. The story primarily focuses on the experiences and struggles of the Congolese people under Belgian colonial rule, and Zachariah serves primarily as a supporting character.