Nao:
Who shows up in the 'Mother's Milk' Happy Event is quite the enigma.
If I had to guess though, it is significantly above the "gods" like HOPE. Yomiel seemed to imply there was a "Center" when it came to god stuff, that it wanted to migrate closer to:
and Yomiel is likely a servant of The Callous god/HOPE:
Which implies there are gods closer to the "Center" than it. Yomiel also implies it's god is more talk than the ones closer to the center:
Assuming The Center determines the hierarchy of things, and how Yasu seems to consider her god young, implies it needs help against the Older gods:
And how HOPE even seems to loop like the girls do:
as shown in the 'How I Feel' Happy Event, if you look at 61/AmIOkay Maya, then I think HOPE/Callous god is actually one of the weakest "gods" overall.
However, there is the whole dead but not dead thing, so back before it "died", it may have been far more powerful (maybe). Now, it seems to need to rely on Yasu, and seems to struggle to function outside of Summer:
Not to mention, like The Wire god, and Pareidolia, it seems to need/want access to Sensei. The whole Users thing and trying to gain favor or trust with Sensei, implies all 3 aren't anywhere close to the top of the pecking order.
Now, back to Nao. It doesn't seem to want nor need to Use Sensei:
It might even actually be him, or at least he seems to be a part of it, as is possibly everything:
Nao also seems to consider itself "an entity so much bigger" than Sensei:
Yet still just a cog fullfiling it's role:
It also somewhat implies there are 3 kinds of gods as well in a way. The gods, the entity they worship, and the entity that entity worships:
Nao, unlike the other "gods", seems to allow progress:
and catalogs it:
Instead of just trying to guide or manipulate it like The Callous, Calm, and Concerned do with Sensei. If anything, Nao might be the god that the gods, we know, worship or worshipped.
Nao may even be at the "Center" that Yomiel mentioned:
Nao also is possibly the "god" that was using Sensei before things became as they are now:
Which might explain why Long Maya, etc, are "freelancers":
The entity that created them (Nao), no longer wants to play with Sensei and rather just watch. The other "gods" are merely using Nao's leftovers.
Still, no matter how "above" things Nao seems to be. It's still just a cog apparently. More than that, it seems to be "half-divine":
But, I also noticed it claimed "we":
which seems to imply, Nao is literally not alone, and considering Sekai is there, and how her name can translate to "The World", I'm thinking it's "The World" that will be watching Sensei with Nao. Yasu has mentioned "The World" before:
and how it's the last of it's kind, implying that whatever it is, is Notable. I also get the sense it likes to watch things happen like Nao:
Overall: I'm thinking Nao is on a higher level than the Seasonal gods. They might be so beneath it, their resources are it's trash. Not entirely sure about the "4th god" though.