For the same reasons, the subjects belonging to Conan, Kull, Solomon Kane, Bran Mak Morn (creations of Robert E. Howard), Thongor (creation of Lin Carter), etc. stories won't be included unless they are closely tied to any of those Mythoses.)
The creations originated from the expansion of the Cthulhu Mythos within the Marvel Universes, or those inspired by the Mythos, aren't included. For example, don't belong in this category:
Some of the Old Ones, such as Yog-Sokot and Niggurab, possibly inspired by Mythos entities, but non-existent in the literary Mythos.