About Call of Cthulhu: Dark Corners of the Earth

There may be some confusion on the true nature of the protagonist. But, if one bothers to understand the mythos, we can see that the Yith only swapped bodies with him. Explaining the sequence where he was in an alien body for a time, and the amnesiac time of his past. His consciousness had been swapped by the Yith, leaving his consciousness in the "original" body of the Yith who had taken over his. Some have proposed that the protagonist himself is Yith but this ignores how the Yith work (they swap minds across time and space, usually for purposes of study). The Yith either wiped his memory or the experience was too traumatic that caused the initial amnesia. As an additional note, the physical form of the Yith is actually not their original, simply what species they had taken over in force (supposedly not all can house their minds for prolonged periods of time).