Here is a theory I came up with after watching a youtubeYouTube video covering the possibility that each Devil Fruit has its own soul. That theory is based on the idea that devil fruitsDevil Fruits have the souls of devils in them, which is why you can notcannot eat two devil fruitsDevil Fruits because the souls of the devils will fight with each other. This theory goes on to explain that the souls of the devil fruitsDevil Fruits influence the person who eats the dfDF, ex. Big Mom wasn’t super devious until she ate the soul fruitAoul Fruit. This could also explain the link between JoyBoy and why the gomu gomuGomu Gomu no miMi is such an important fruit. So
So, if you believe that df’sDF’s have inherited will’s, you start to wonder where the original will comes from, who first imprinted their will on the dfDF? We know that df’sDF’s popped up during the void centuryVoid Century. We also know that during the void centuryVoid Century, there was a giant war between a super powersuperpower country and 20 other countries which later became the world governmentWorld Government. So, what if the thing that sparked the war was the super powersuperpower country inventing devil fruitsDevil Fruits? What if they developed a way to create these devil fruitsDevil Fruits by imprinting the will’s of certain strong warriors into them? This new technological development would have made this country unstoppable, so these 20 kingdoms came together to stop them. Connecting it back to JoyBoy, you can theorize that his will was imprinted on the gomu gomuGomu Gomu no miMi fruit, which is why the world governmentWorld Government wanted that fruit so badbadly. My
My last point is that the Celestial Dragons consider themselves Gods, and they referred to their natural enemies as people with the willWill of “D”, calling them Devils. Their original enemies were the strong lost kingdom who they would have referred to as devils, since they see themselves as being on the moral right side. Those “devils” created fruits that gave them immense strength, therefore they became known as devil fruitsDevil Fruits. And the people with the willWill of “D” are the decedents of the lost kingdom who can unlock more from eating a devil fruitDevil Fruit because their ancestors were the original creators. This
This is my first time posting a theory, so sorry if it’s a little convoluted, I have just been thinking about this for a while and had to share it.