There’s actually more than most people realize on primordial deities. Part of the problem is that the primodrial deities aren’t as popular and so not as much of it leaks into pop culture and easily accessible areas. Part of it is that people sometimes don’t realize that a particular deity is classified as a primordial deity.
The primordial deities in Hellenism are known as Protogenoi, which means roughly “First Born”, and are usually the deities which are the physical embodiment of their domains. According the Theoi.com the Protogenoi are as follows:
- Aether
- Ananke
- Chaos
- Chronos
- Erebos
- Eros
- Gaia
- Hemera
- Hydros
- The Nesoi
- Nyx
- Okeanos
- The Ourea
- Phanes
- Phusis
- Pontus
- Tartarus
- Tethys
- Thalassa
- Thesis
- Uranus
Some of the deities listed, like Uranus, Nyx, Eros, Gaia, Pontus, and Chronos we actually have a fair amount of art and literature that includes them. Others, either they never had particularly large cult followings, or we just haven’t found much surviving material.
A lack of modern art and literature about these deities may very well stem just from the general lack of presence in main stream representation. There also tends to be a misconception that the older generations of deities stopped being worshiped with the rise of the Theoi.
It can certainly be more work to find information on some of the Protogenoi, but it’s worth it if you’re interested in their worship.