The Voice of All Things refers to messages conveyed by inanimate objects and animals that do not speak the human language. Only a very small number of people in the world possess the ability to hear this voice.
The Voice of All Things is a mysterious and incredibly rare ability that allows the user communicate with people, creatures and objects in the world around them without the need for a physical message, such as speech or writing. The Voice of All Things should not be mistaken for the ability to simply understand animal communication. It's more like hearing the animals thoughts or understanding the message in their heart; thus, the communication offered by the Voice of All Things can be considered akin to telepathy. The messages that come from these animals (as well as the messages that come from objects) appear to be completely inaudible to anyone who cannot hear the Voice. So far, only a minuscule number of people in the world have been shown to posses the ability to hear the Voice. Only one race in the world, the Three-Eye Tribe, possesses the innate ability to hear it; not only is this race extremely rare, but its members must also work to awaken the ability.[3]
In most instances, whenever someone with the ability to hear the Voice comes in close proximity with an animal that can use the Voice, they will hear a constant, seemingly unintelligible noise, which can overwhelm them, especially if they are unfamiliar with the concept of the Voice and the ability to hear it.[4] It also appears as though people can hear this voice to different degrees of proficiency. Whereas Roger, Oden, and Momonosuke constantly heard the Voice, or at least "felt" it around the Sea Kings and Zunesha,[5][6] Luffy showed no indication of this; however, the Sea Kings still noted that Luffy had picked up their voices,[4] and Luffy was later able to hear Zunesha when it called out for help.
It does not appear as though the Voice is a universal trait among every single object and species in the world; everything that has been seen communicating using the Voice has been an animal of above beast level intellect, such as humans, the Sea Kings, and the giant millenium-old elephant Zunesha, or objects of notable status in the world, like the Poneglyphs. This attribute was noted by Gol D. Roger, who came to understand the Poneglyphs' great importance due to being able to hear their voice. Interestingly, the Poneglyphs were developed by the Kouzuki Family, whose two most recent leaders are known to have been able to hear the Voice.[1][3][7][6] Furthermore, as shown with Roger, though he was able to hear the Poneglyphs' voice (enough to have a vague idea of its contents), this did not mean he could actually read the text or entirely decipher its meaning, he simply understood that it held great importance.[7] Big Mom believes that the Voice of All Things will enable one to decipher the Poneglyphs, but given Roger's observations, whether or not this belief is true is uncertain.[3]
Some people who can use the Voice of All Things have displayed other telepathic abilities; such as sending out messages back to the entity they hear,[8] as well as to fellow Voice hearers and other people who cannot hear the Voice.[9] These instances are significantly different from previous applications and are unconfirmed to be a part of the Voice, but they do display essentially the same elements and effect.
Kouzuki Oden: Oden was also able to hear the voices of the Sea Kings[14] and the great voice at Zou similar to Roger.[13][6]
Monkey D. Luffy: Luffy is able to perceive and understand animals like the Sea Kings and Zunesha as well, and he's able to converse with Emet.[4][15][2][16]
Kouzuki Momonosuke: Momonosuke, Oden's son, is also able to perceive Zunesha. Similar to his father and Roger, he felt strange after arriving at Zou,[5][17] which got stronger when he got closer to the Whale Tree.[13] Unlike all others, Momonosuke was actually able to converse with the elephant, giving it the order to attack the Beast Pirates.[8]
Three-Eye Tribe: The members of the Three-Eye Tribe are rumored to have access to this ability through utilizing the power of their third eye. However, mixed-blood members might not necessarily be able to use it at all (or at least, implied by Charlotte Linlin, it could awaken later in life).[3]
Trivia[]
The ability to perceive the Voice of All Things bears similarity to Shirahoshi's and Poseidon's ability to communicate with Sea Kings.
Some other characters have demonstrated a similar ability to hear and or understand animals or objects, though those were either single occurrences or a different ability:
Tony Tony Chopper and Onimaru, both being animals, can understand other animals, and after eating Hito Hito no Mi series Zoan Devil Fruits, can communicate with humans as well.
The Five Elders' unknown telepathy ability appears to function similarly to the telepathic abilities of Voice users. Whether this is an application of the ability or a different ability entirely is currently unknown.
The anime-only Hiso Hiso no Mi allows the user to communicate telepathically with (but not control) animals.
Luffy has demonstrated this ability in two non-canon instances.
In the Warship Island Arc, he was able to read Ryu's mind, something nobody else could do except the user of the aforementioned Hiso Hiso no Mi.
In the One Piece: Unlimited Adventure video game, he was able to hear the spirit of Sealed within the Orb, as well as commune with him when the Orb broke and released his spirit.
Zoro displayed a similar ability during is fight with Daz Bonez. While being close to death, Zoro was able to feel the "breath" (呼吸,kokyū?) of the rocks that were about to crush him, which allowed him to dodge them. He could also feel the breath of his sword which allowed him to find them under the rubble created by Daz's attack.
The concept of objects having their own "voice" is similar to a ship developing a Klabautermann, a water spirit that embodies the will of a ship that is well loved and tended to.
↑One Piece Manga and Anime — Vol. 100Chapter 1015 (p. 12-15) and Episode 1036, Luffy seeming to call out to Momonosuke and the Heart Pirates with the Voice of All Things.
↑One Piece Manga — Chapter 1122 (p. 16-17), Joy Boy's flashback with Emet.