An editor at Garamond Press and Casaubon’s mentor, whose experiences and decisions drive much of the narrative’s central conflict.

A mysterious figure claiming vast knowledge of the occult, whose influence and rivalry with Belbo create tension and intrigue.

An editor specializing in reference materials, contributing his interest in Jewish mysticism and numerical symbolism to the developing Plan.

Casaubon’s intellectual equal and partner, who provides critical insights that challenge the protagonist's project.

An enigmatic woman who captivates Belbo, her relationships highlighting his insecurities and struggles.