I prefer to think of them as sovereign entities rather than kings or queens.
- Big Mom uses a move called Ikoku Sovereignty lol (Mighty Nation)
I think it goes further than kings or queens, actually. They might just be the end-product.
In the Ancient Greek story, it started with primordial entities and then they got killed by titans who got killed by olympians which eventually led to kings and queens who were favored by gods in wars.
After killing the previous gods, poseidon, pluton, and zeus claimed the sea, the underworld, and the sky.
The underworld is part of gaia, and represents the space created when a hammer fell to earth during the beginning of creation (it took 9 days to do this apparently?). The underworld is known as Tartarus and Hades made his kingdom in the middle of it.
In this story, the reincarnation of poseidon is a god of the sea.
Zeus is a thundercloud.
Nobody knows where or what Pluton is.
My feeling is... Momonosuke is paired with the Mink Tribe representing Hades and the Underworld, Vivi is paired with the Sky Tribes representing Uranus and the Sky, and Shirahoshi is paired with the Fishmen Tribe representing Poseidon and the Sea.
Aisa and Coby both show the ability to hear voices. I don't have much to say about them.
According to Hesiod's Theogony, Gaea (Earth), emerging from primeval Chaos, produced Uranus, the Mountains, and the Sea.
Uranus = God of the Sky = Claimed the Sky
Pluton = God of the Underworld = Claimed the Mountains
Poseidon = God of the Sea = Claimed the Sea
TYPHOEUS (Typhon) was a monstrous storm-giant who laid siege to heaven but was defeated by Zeus and imprisoned in the pit of Tartaros. ... Later poets describe him as a volcano-giant, trapped beneath the weight of Mount Aitna (Etna) in Sicily. In this guise he was identified with the giant Enkelados (Enceladus).
They liked to trap things under mountains to force them to remain in the pits of tartarus.... :/
The Kuzuki Clan has been known to be specialists in dealing with Kariouseki which is a stone with the radiation of water inside it. Unnatural stone. They have also been known to deal with poneglyphs which are super hard rocks. Also an unnatural stone. In other words, they seem to be experts with rocks.... and mountains are basically just big rock formations.
There's more to say, but I'm tired.... I'll watch your videos for sure.
There's also different versions of how the Greek gods worked... that's really annoying to think about lol... so I really just try to have fun with it.
Additionally, the concept of Sovereign Haki follows suit with the concept of Sovereign Entities. King's Haki, or the King's disposition, relates with the Color of the Haki of the Supreme King. However, Sovereign Haki denotes the same thing when described as Supreme Sovereign Haki.
Sovereign: It often describes a person who has supreme power or authority, such as a king or queen. ... Nations and states are also sometimes described as "sovereign." This means that they have power over themselves; their government is under their own control, rather than under the control of an outside authority.
Likewise, a person often has difficulty developing King's Haki or Sovereign Haki if they are required to submit their will to another person. As such, many of the 20 kingdoms kings may not possess this kind of Haki simply because they submit to the celestial dragons. This may also explain their prior reliance on the Warlords of the Sea to protect their kingdoms.