Saku is a small, wiry kobold with rust-red scales, a narrow muzzle, and large ears that twitch toward every unexpected sound. Within a minute of meeting him, most people notice that his eyes rarely settle on the speaker. Instead, he watches doorways, ceiling beams, empty corners, and the spaces just behind people's shoulders, as though tracking an unseen companion. His hands are unusually dexterous and heavily stained with ink, their claws blunted from years of copying inscriptions onto scraps of slate, bone, and old parchment. He wears scale mail beneath a weathered clerical robe, and his holy symbol is a small leaden tablet etched with prayers in several incomplete scripts.

Saku is patient, observant, and sincerely compassionate toward frightened or misunderstood creatures. He asks precise questions, remembers obscure details, and treats every haunting as a possible victim rather than merely a threat. He is socially awkward but not timid, and he will calmly challenge respected authorities if their explanations lack evidence.

In Saku's hometown, people called him the child of phantoms. He was born during a night when the mine tunnels filled with strange voices, and from the time he could speak, he answered someone no one else could hear. The phantom was not always the same. Sometimes it sounded like an old kobold priest, sometimes like a frightened child, and sometimes like a calm stranger describing events that had not happened yet. Saku learned quickly that asking others whether they heard the voice only made them uncomfortable. Since they disliked being around him, and he disliked the way they watched him, he spent much of his childhood in abandoned shrines and forgotten storerooms, copying inscriptions and assembling theories about the dead. His studies eventually led him to a neglected shrine where the phantom began reciting prayers in a language Saku did not know. When he repeated them, divine magic answered. Saku does not know whether the voice belongs to a god, a dead scholar, a trapped spirit, or merely a part of his own mind, but he has decided that the distinction is less important than the guidance it provides. His studies of forbidden histories drew the attention of a Knowledge Domain priest, who taught him to distinguish revelation from evidence without dismissing either. As a Sage and a cleric, Saku now travels to gather evidence, investigate supernatural disturbances, and determine why the phantom follows him. He hopes that somewhere in the world there is a record explaining what he is, even if the answer proves that the voice has been lying to him all along.