Voadam
Legend
A bunch of full caster and powered/partial caster champion model classes in D&D could be appropriate for not-gods.
Druids and Rangers for nature/primal spirits/Titans/Fey/Spirits/Shub-Niggurath.
Warlocks and Hexblades for Great Old Ones/Fiends/Fey/other beings (genies, vestiges, etc.).
I am not super familiar with the 4e psionics classes and their being an antibody reaction of the world spirits dealing with non-worldly threats but to use 3e concepts you have psions/wilders and psychic warriors/soulknives.
Another popular model would be necromancer and death knight from Everquest RPG for underworld types like champions of Hel.
Shadowrun has shaman/mage and adept.
Druids and Rangers for nature/primal spirits/Titans/Fey/Spirits/Shub-Niggurath.
Warlocks and Hexblades for Great Old Ones/Fiends/Fey/other beings (genies, vestiges, etc.).
I am not super familiar with the 4e psionics classes and their being an antibody reaction of the world spirits dealing with non-worldly threats but to use 3e concepts you have psions/wilders and psychic warriors/soulknives.
Another popular model would be necromancer and death knight from Everquest RPG for underworld types like champions of Hel.
Shadowrun has shaman/mage and adept.