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.
- The Dweller-in-Darkness, despite being the spawn of Cthulhu.
- Uluath, clearly inspired by the Mythos on several aspects.
- Ohris Dehjmal, a necromancer related to Mythos' elements.
The authors who have contributed to the Mythos are listed in the subcategories, but not all of their creations are necessarily part of it.