Because Blackbeard threads have been becoming popular again, I figured I'd repost my old one from the Forumpiece days, mainly to share it with you all and discuss but also so I can have it on this account if I want to refer to it later (took me a decent while in the archives to find it). This theory ties in very closely with my theories on how souls work in the world of One Piece, so while it's not strictly necessary to understand this thread, I definitely recommend you check it out here. Anyway, below, lies the [slightly edited] thread from 4 years ago: Wasn't sure whether to call this a theory or opinion, but I suppose it's the content that matters more. Well, anyway, what I'm about to write is nothing that you haven't heard from me, and most of the content can be found scattered about my posts (and others') on the forum. I'll still write this thread with the assumption that you haven't heard anything I've had to say on this topic. As some people seem to think the same way I do, and there hasn't really been a thread like this as yet, I figured I might as well just make one. So, straight to business. Devil Fruits are one of the most curious items I've come across in Manga. We've heard many things about them, some of them even contradictory with each other, but we have essentially all the information regarding them save for two points: How do Devil Fruits work? Where do they originate? I'm only going to focus on the first question, as there are countless theories on this forum that attempt to answer the second. How do they work? We've been given quite a bit of data about them, however often there are shady hints dropped here or there that are often difficult to accept at face value. I will refer to a few things I can remember about them that were said a lot earlier in the series, and use this to explain my reasoning. In the anime's first and second episodes, Alvida and Captain Morgan both comment on the rarity of Devil Fruits, and hint that there was more to delve into regarding them in the Grand Line. Morgan even said that he wasn't sure they existed, and believed them to be a myth until he met Luffy. We were led to assume by this point that these two shared the general perspective of the public - or at least the residents of East Blue, and that this at the time was the truth. I think that Oda at the time (and maybe even currently) still had not devised everything about the limitations of the Devil Fruit, because this statement is strongly contradicted later. For one thing, it is almost certain that the public would have a basic knowledge of a Devil Fruit and how they may impact them. Insignificant Marines have had Devil Fruit powers, and same with a wide variety of pirates that have appeared throughout the story of One Piece. Bounties which the public receive weekly/monthly also make certain nick-names displayed, quite often ones that heavily indicate that a pirate wields tremendous power (e.g. Fire Fist Ace). Smoker who was the same rank as Morgan was not only a Devil Fruit user - but a DF user of the strongest category, meaning that either Oda hadn't thought of the regularity of DF's at the beginning, or that Morgan was heavily under-educated. That was probably irrelevant, but I want to reinforce the idea that there is the possibility that Oda may have not yet decided on what I'm about to guess at, so this is more of an idea that covers all the facts that we have been given so far. The source of my information will be Spandam's explanation to CP-9 in this theory. Spandam explains that if you eat two devil fruits, the residing devils will combat each other and kill the host in the process. To me, this hints at a whole lot of things, and I will begin my theory pretty much just using that information, as well as a few other facts here and there that support this. So, as Spandam suggests, I believe that there is a semi-sentient being that inhabits each devil fruit known only as a 'devil'. These beings seem to be the largest force behind the changes in an eater, and they also seem to have a hatred of each other. These devils don't seem to have any desires of their own, and do not seem to have played any role at all in the plot save for their contribution to Devil Fruit abilities. They are usually docile, and I say they are semi-sentient as they seem to be aware of the process involved in altering a host's body, knowing that they hate their own kind, and do not have any sense of awareness or self-identity - similar to PX-0's single-minded processing. Now there's the question of what the devil does. It will spend most of its life inside a fruit that innately changes upon its inhabiting it, and then transfers to a sentient host when the host eats it. I think it is interesting that the devil will behave quite differently when it inhabits a human or fruit. A fruit will simply change shape and colour, while a human will gain all the powers the devil boasts of providing. Clearly it recognises a difference, and perhaps finds a fruit far more accommodating than other inanimate objects likely due to the ease in which they can be changed. Vegapunk's method for making a DF activate its abilities in other inanimate objects may contradict this notion, however, as you may argue that there clearly must be another factor that will make a devil awaken under different circumstances, however I can only guess that Vegapunk simulates a human's system inside the object and it will activate there. I'll probably edit this once we discover the means that VP uses to make objects ingest DF's, because I'm almost certain that this theory can adapt to suit whatever Oda can think of. This is where I need to get all technical. Before I begin this part, I should mention that I believe that there is a key significance of a soul and body in the OP world, and I wrote a whole thread about it already :p. Now, I believe that in the One Piece world, Oda has made it so that every living person has a soul that inhabits the body. It isn't the brain as such, but a soul that provides the consciousness and voice. This is mostly backed up in the character of Brook (more info in my souls thread), whose soul allows him to talk and be conscious without a voice box. I believe that a devil is only interested in its host's body. The devil will only alter the eater's body, but his soul is left unpolluted by its presence. This explains a variety of things, such as why Haki makes no difference whether one is a DF eater or not, or why Logia types can still be sentient although their brains have become an element. Now, there is also the question of what exactly the devil does to the eater's body. I have no deadset theories on this, but an idea I can think of is that the devils have all the power that they give, and they infuse their essence into their eaters and alter their bodies. It's not exactly that the devils provide the power, but that they are the power behind all the powers. They simply give an eater full control over the power they provide. Think of it more as Ace not making fire, but Ace telling the obedient devil to make fire instantaneously. Maybe more the devil can read their hosts minds and then obey the wills of their eaters. ' As Blackbeard's Devil fruit and the question of how he obtained two powers is relevant to this topic, I will include my thoughts on how he obtained WB's DF. Going off what he says to Ace that he sucks in DF powers, I believe that when he does this, he forces the devil out of the host until their contact is broken. I personally thought that the change was permanent until I saw Ace using his powers again, which had me thinking that the devil would be (voluntarily or involuntarily I don't know) confined to their host so that they are not separated until death. Now I'm also considering the possibility that he could have sucked the devil right out of Ace if he had the time to do so, probably killing Ace in the process. I don't know if this ability allows him to remove devils from their fruits either in a non-harmful way. Now when it comes to how he got WB's power and other peoples', I have a few ideas. We don't know exactly why the curtain was put up around WB, but a petty way for Oda to hide the process from us without any other reason does not seem very likely at all. I would also like to comment on the fact that the curtain was black. One of my ideas is that BB threw the curtain to confuse or trap the newly-released devil so that he could absorb it, and the dark curtain would compliment this. I could only explain the time it took him as either him quickly searching for it in the curtain and quickly absorbing it or taking a long time to absorb it. There is also the idea which i think is less likely, and that's that WB's lost devil immediately became a fruit and BB sucked it in with his ability. I don't think it has anything to do with the Will of D, because it can't be a coincidence that BB can suck in DF powers with his ability and also obtain two of them because of two unrelated facts. In case anyone points it out, I also think that BB's devil is superior to other's, explaining why many can reside in the same body, and that this is one of the other perks that comes with the disadvantage of not becoming intangible. Hope you liked this thread, and I think I should be sorry that it's another long one that has no pictures :p. Let's see what you guys think.