Am I the only one who thinks of a dog or a giant robot when pluto comes to my mind? Oh and pluton reminds me of that planet which is no longer a planet, and that was the only reason I knew it was a god (since all the others are gods). Who cares if its greek or roman. Well it might be interesting (I actually like mythology) but its not like Oda did an extensive search.
Well, if he really did let me add some foolish theory to this discussion.
Warining, foolish theory, nearly(read fully) fanfiction ahead, imagine the voice of the tekken narrator, just for drama:
Chronus, a mad scientist lived in a beautifull world. Full of ancient amazing creatures. The sea was governed by merpeople and fishmen. The land was populated by many man giants and many other races.
Chronus always admired the power of mermen. They could talk with fish, and the fish would listen, and by pure kindness would do what they wanted.
But there was other thing Chronus admired, the power of the mighty sea kings, which no merman could command.
Chronus one day found a wounded sea king, and brought him to his lab. After many experiments he tought he could do it. He kidnapped a mermaid, and did experiments on her. After that he empregnated her, and the daughter was named Poseidon.
Poseidon had the power to control them, the mighty sea kings. But chronus was not happy. With the sea kings under control he would control the sea, but what about the lands and the skies?
To control the land he created pluton, a Tank (A ship is far less awesom). And to control the sky he created a cloud, after many failed atempts. An autosuficient cloud, whose power came from many different shells.
And is plot to control the world was begining. And it would suffice, if it wasn't for one boy, the only hope and joy of the world. Joy Boy, one of his test experiments, one who's will could be materialized. He was in a cell right near poseidon, and they were deeply in love.
Joy Boy managed to get free, and released the princess.
And it ends with Chronus eating a time devil fruit, after eating his three creations INCLUDING the tank (and the island).
:3