We also have a clue as to the powers of these fruits:
The Azure Dragon is associated with wind and rain manipulation which we have seen with Kaido through his air sickles, and thunder roar, and changing of the weather.
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The Vermillion Bird is associated with fire manipulation which we have seen with Marco’s devil fruit.
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The White Tiger is associated with electrical manipulation and metal manipulation which might give us some insight into Yamato’s powers if she had the fruit.
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And finally the Black Tortoise is associated with water manipulation. In some media Genbu also has the ability to transverse between planes of existence of the living and spiritual worlds.
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*Theory by GogleyLoosa