Four God's of One Piece

Sun God - Luffy

Rain God - Sabo

Forest God - Blackbeard

Earth God - Eustass Kid

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𝒲𝒽𝓎?!

First of all, Luffy had been confirmed to be the Sun God... He is the Sun God because the Sun Rises at Dawn and he is the dawn of Worst Generations Pirate... Dawn also symbolizes rebirth and awakening from slumber thus after having a dream which his pirate crew is made of... "The pirates who have dreams" and he is the captain that will brought them see their dreams come true... I speculated that Luffy's dream is for all dreams to come true which makes him the Sun God who will liberate them from shackles of mankind to reach their dreams...

Second, Sabo is the Rain God... He is the Rain God because he yearns for freedom and is also part of the revolutionary army... He ate Ace Devil Fruit which makes him inherit Ace dream to become free... In order to achieve this, he chose to become pirate and traveled the sea... Sabo who is recruited by Monkey D. Dragon had a chance to travel to a lot of places which makes him free as a cloud... Also, fire have a lot of forms and colors just like water... He is powerful enough to escape from the Gorosei... There is also "Rain of Fire" during Armageddon in the Bible.

Third, Blackbeard is the Forest God... The Devil Fruit chose him because he is the person who had lost a lot.... First, he lost his two sibling during decapitation which leave him only one head just like a regular human... Second, his crews are also the same, they lost a lot from themselves: it is also the reason on why he had recruited Aokiji because he had lost his place in the world and is finding a way to redeem himself... Third, a forest had a lot of fruits hence he is collecting devil fruits for his crews...

Fourth, Eustass Kid is the Earth God... Well, during his awakening he can control anyone for example Big Mom just like a magnet... If he expands more of his abilities, he can control all objects like a magnet and this is almost synonymous to gravity. I bet that his most powerful ability would be gravity bomb which he can blast a ball of Black Hole to his enemies... He is already using electromagenetic laser cannon which is the early stage of black hole cannon... Because of this, he could be labeled as "God of Destruction" just like how he is doing since the start of his pirate days...

No... it is just a speculation...

Dragon should be rain god cuz whenever we see him there is rain and storm

Maybe... There are a lot of people who say so...

I am also finding similarities of the said characters with the four horsemen of the apocalypse with their behavior. The form of their devil fruits have the same color with the horses the horsemen ride. Luffy have white form similar with the white horse, Sabo have red form similar with the red horse, Blackbeard have black form similar with black horse and Eustass Kid have violet form similar with violet horse. Note: Four Horsemen of the Apocalypse (Russian: "Воины Апокалипсиса") is an 1887 painting by Russian artist Viktor Vasnetsov.