Chaos is the creator of all, ( alongside with cows ofc) he created the earth (Gaea) and Ouranos. But what is he? Well this is my theory.
Chaos is described as being the leader of Cosmos as the wiki page puts it “His power is immeasurable” but before he crates earth he was the sole being in the universe (with cows) so here is my theory:
Chaos is a family in a way, generations. You see gods speak about beings they never saw but they were there early right? My belief is that there were multiple universes beforehand. Another thing that supports this theory is: why cows? Why not a powerful being? Well it’s simply that they didn’t get destroyed.
You see no wonder maybe the gods think there good, it may be cause the gods before them were worse. They know everything, why not this? Tartarus and his Children day and night, they speak how they should be respected due to their age, that’s because in the underworld nothing changed. Why do you think we see our heroes find odd creatures there? It may be just from previous universes.
This idea isn’t completely new, we see there be 3 gods in Hindu mythology that destroy and create. We shouldn’t call chaos chaos, we should call him: Chaos I, Chaos II Chaos III chaos IV Chaos V etc etc
Edit: As well, opinions are greatly wanted/feedback