Zach Taylor

Zach is an Angean and the protagonist of The 15 Keys: Inquisition, and also appears as a minor character in The 15 Keys: Zero Point. It is noted by multiple inquisitors that Zach has never existed in another universe until world 15 was created by the Yuno of world 14's wish. This means that no alternate reality versions of him exist.

History
Zach was met by Raiko during the events of The 15 Keys: Zero Point, but the two interacted little. Zach is first seen again during the events of The 15 Keys: Inquisition during the final paragraph of chapter 1, which used every paragraph before to describe an event from world 14 or earlier during one of the first 14 inquisitions. After this the rest of the story is told from his perspective, and he becomes the main protagonist of Inquisition, succeeding Raiko as the protagonist.