He used to join Gol D. Roger’s crew, we saw him saving Luffy from an almost certain death, he has Whitebeard’s and Mihawk’s respect, he’s one of the Yonko and he’s the man who made Marineford War ending just going himself on the battlefield and saying “stop”. What makes Shanks so powerful?
First of all, I don’t think he has a Devil Fruit power, since when he saved Luffy, he has been able to stay in the sea water without losing his strength or drowning.
But how did he managed to save Coby from Akainu’s attack during Marineford War? I mean, he appeared out from nowhere and he stopped Akainu’s magma punch just using his sword, which wasn’t even covered with Armament Haki, this seems impossible!
Well, my theory is the one that follows: I think Shanks’ powers are related with his Haki; in fact, I believe that he developed a kind of “superior” ability, that I call “Advanced Haki”, which can be used in different forms and shapes and both for attacking and defending. It would be the same used by Mihawk to attack Whitebeard and by Rayleigh to defeat the elephant during Luffy’s training.
Maybe Shanks used this kind of Haki to cover his sword against Akainu, but this would mean that the Advanced Haki is a lot stronger than Armament Haki, which is the Haki specialized in defending and resisting to strong hits.
In addition, Oda gave us a proof of this ability of Shanks when he went on Whitebeard’s ship and Shanks’ Haki caused lot of people’s faint and even physical damages to the ship; we know for sure that this is really strange, since not even King’s Haki has such a power to cause physical damages to things.
Furthermore, I think that Shanks’ probably has developed this ability thanks to a particular training. Why? Because we know that, when Luffy used his King’s Haki in Marineford, he knocked almost everybody out, but after Rayleigh’s training he has become capable of controlling his King’s Haki and knocking out only people he wants to knock out; this means that Haki is an ability improvable with time and training, so that maybe Shanks at the beginning of his “career” didn’t have the possibility to use this kind of Haki, he just became capable of using it as the time passed.
In conclusion, we can’t know exactly what Shanks’ abilities are, but for sure he has something incredible, especially since he’s supposed not to own any Devil Fruit. I can’t wait the moment in which Shanks and Luffy are gonna fight each other!
If you start surfing the net and you research what are the main events in One Piece which are nowadays inexplicable, for sure you will find that a lot of people don’t understand how can Aokiji and Akainu be intangibles; in particular, those people think of their intangibility when they remember the Marineford War. In fact, during that arc, we saw a lot of strong fighters and also a lot of violent fights; two of those fights which deserve a special attention are the one between Whitebeard and the Admiral Aokiji and the one between Marco, Vista and the Admiral Akainu.
To begin with, I’m going to consider the first one: during that fight, at a certain moment we saw Aokiji jumping towards Whitebeard in order to attack him and Whitebeard, who had foreseen Aokiji’s attack, hit the Admiral at the centre of his chest with his weapon; everyone thought that Aokiji was dead because Whitebeard is a Haki user and, as we know, the use of haki nullifies Logia-type Devil Fruits powers, but suddenly Aokiji moved, so he demonstrated us that he was still alive.
Secondly, as far as the second one is concerned, during this other fight, we saw Marco and Vista, who probably are in the top three of the strongest members of the Whitebeard Pirates, dashing towards Akainu, who had just killed Ace, and hitting him; despite the fact that Marco’s kick and Vista’s cut had sliced Akainu’s body, the Admiral healed his wounds as if Vista and Marco were two normal people, although we know that they are able to use haki in the same way of Whitebeard.
So how could have happened something like this?
Well, the explanation to this incredible (and strange) fact has been given us by Oda in today’s One Piece manga: in fact, in the fight that is going on between Luffy and Katakuri, we came to know that there is another type of haki, called “Observation Haki”, which gives to the user the ability to apply a sort of advanced observation to certain situations, making them able to predict enemies’ attacks; this can be considered like a quick look in the nearest future.