|For his video game counterpart, see Duo (program).|
Duo.EXE (デューオ Dyūo) is a massive, mysterious alien NetNavi who is alluded to in the second half of Rockman.EXE Axess and appears in the next season as the main overall antagonist. It is eventually revealed that he was created on Earth in the distant past by an ancient civilization who felt their network was going down a dark path and Duo was made to maintain it, and was launched into space, his rocket becoming a “comet” (dubbed “Duo’s Comet”) that only those marked with his "Crest" could see. Evolving from his original purpose and seeing his creators and their civilization as evil, Duo eradicated all life on Earth from that time, becoming a “Cybernetic God” that travels the cosmos, analyzing and testing planets and civilizations to see if they are worthy, and destroying those he deems are not.
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Unlike his video game counterpart, who is the operating system of an anti-planet missile, Duo.EXE is an alien NetNavi created by an ancient civilization to maintain their network as they felt it was going down a dark path.
Duo is an emotionless NetNavi who only sees things as good or evil, eliminating planets and civilizations that he dubs evil and a threat to the universe indiscriminately. Despite this, brands thirteen people on current day Earth with his “Crest” and gives them a trial to prove that humanity deserves to continue on.
Duo's personality in both the anime and the games are almost identical.
Duo never attacks a being unless he is attacked or provoked. This happened in the anime mostly, when he didn't outright destroy Earth in his visit, but ended up leaving behind two probes to observe humanity and see if they were fit to survive. He later attacks when one of his probes, Regal, was defeated after the human had defected from his original purpose and attempted to rebel against Duo, which likely caused him to return and deem humanity to be evil. He did decide to give humanity a second chance after being impressed by Cross Fusion, believing that it could potentially be something that would give humans hope for the future, which could be due to how Cross Fusion requires a bond of trust, something Duo might have considered to be a good quality to be explored.
This, however, was only a small setback, as when Regal had returned and caused a disturbance, and how many humans had used his Asteroids for evil purposes, Duo finally made his move, first killing Regal due to his treachery, and then destroyed the Earth. However, Cross Fusion still made him curious, as he could not understand what it means to have a bond of trust and love, and thus was willing to spare the Earth when Barrel offered to fuse with him, along with Colonel, so that Duo could understand what it means to Cross Fuse with a human.
Duo is unseen in Axess that was referred to by Ms. Yuri that had passed by Earth fifteen years before the series and in the process, crashing into a plane and destroying everyone, save for Ms. Yuri and Regal, both of whom were passengers inside. He turns the two into probes to monitor human life, altering their human DNA to make them superior to other humans, then leaves them in the ocean to be found and raised by Dr. Wily. However, both Regal and Ms. Yuri defected from their original purpose and sought to control the world, though Ms. Yuri strays from that as well after regaining her memories of her sister. Ms. Yuri's Mission
When Regal initiates a Dimensional Area that envelops the globe at the end of Axess, Duo is alerted to the chaos and sets off to perform "Earth Erasure." Coming to Earth, he created giant viruses to materialize in the Real World and cause havoc and chaos. However, after Netto Hikari and Enzan Ijuin delete the viruses, Duo appears before them and showed them what he had done to his home planet, and declaring that he would do the same to theirs. However, Duo became curious to their forms, being that of human and NetNavi, which is something that he had never encountered before in any other planet that he had come across. After he got an explanation about how Cross Fusion worked, he becomes intrigued by Cross Fusion and decides to spare the world so that it may prove to him that it merits survival. He reverts the damage caused by his advent, then marks thirteen individuals with the Crests of Duo, those chosen specifically for such a purpose. One of his crests he had sent ended up going back in time to Colonel Barrel, instead of staying in the present. Humans would then believe that Duo's comet had passed by, but rather, those with his crests would see that Duo still remained, although some humans were still aware of Duo remaining without his crest. Duo (episode) Earth Erasure
Afterwards, Duo crashed his comet into the planet, and went back 30 years in time, to when Earth's network society began, and had Slur use the technology to distribute Asteroids to humans of the present time from the Past Tunnel that he created from that. The Asteroids were meant to enhance any human's greed and other negative emotions, and the negative emotions were converted into energy sent to Duo's comet to activate it, by which Duo would then destroy the planet. However, those that had the 13 crests would be able to take control of the comet and stop Earth's destruction.
Duo wasn't seen again until Netto and the others had discovered the ruins of that held the Crest of Duo, in which they ventured inside and soon activated a digital memory that informed them of Duo's origins, which had sent an energy burst that Duo and Slur recognized, with Duo merely saying Creator.
Netto and the others then learned that Duo was created by an alien race (simply called the Creators by Duo): the extraterrestrials that oversaw this genesis intended for Duo to control their "chaotic" network beyond the boundaries of their home planet, and he was therefore installed into a shuttle that was launched into space, eventually becoming a comet once it reached the outer limits of the atmosphere. Duo, however, defected from his original objective, as he felt that their network was "flawed-evolutioned" and that he would destroy anything that would "harm the Universe" . From his comet, Duo laid waste to the planet, but not before some of its inhabitants escaped on a floating city, eventually landing on Earth during the age of the dinosaurs. It was then that the Creators began researching methods of halting "The Cybernetic God". Eventually, the survivors came across a process similar to Cross Fusion, but were unsuccessful in completing a viable hybrid being, and only their city remained intact by the time it is discovered in Stream, shielded by technology akin to the "Dimensional Areas." However, Slur then moved to the ruins of the Creators and had them destroyed. Whether this was done on Duo's orders is unknown. Stellar Memory
Duo's final appearance was at the end of Stream, when Regal entered his comet and used the 13 Crests to take control of the power and technology held inside. However, after seeing this happen, Duo immediately interfered, killing Regal as part of the process to "fix" the "flawed-evolutioned Network", and then began Earth's Erasure once more, destroying the planet 30 years ago, but the holders of his crests were able to enter his comet before they were destroyed, making them the only survivors. Toward a New Future
Confronting the Cross Fusion team, Duo let out that he had postponed Earth Erasure and granted the 13 Crests to 13 humans so as to see through what kind of power Cross Fusion withheld: the 13 humans were supposed to come into the comet to meet him but they were too late because Earth had already been destroyed.
He then expressed that because humanity's greed and evil infested the world with the Asteroids, and claimed humanity itself speeded up its end. He also deemed that even Cross Fusion was but the legacy of a "flawed-evolutioned" network civilization, and thus must be destroyed. When he was met with opposition, Duo quickly defeated them all with a single attack, and then stripping them of his crests, rendering the humans unconscious. He then separated the NetNavis from their humans, and asked them to swear loyalty to him, deeming that while they were from a "flawed-evolutioned" network civilization, they were still excellent NetNavis, and in order to seek a new future for Navis, he wished for them to come with him and escape the shackles of humanity. If not, then he would delete them as well, as unfortunate it may be.
However, they all refused, willing to be deleted than abandoning their partners, making Duo question why they would do such a thing when they are the source of evil that destroyed their own planet. The Navis explained that humans can learn from their mistakes and grow, change a future of despair into one of hope, how there are kindhearted humans as well, and even if some were bad, they wouldn't abandon them. Unable to understand, Duo asked them why they were so fond of their humans, to which Rockman explains that they liked humans, and that Netto was his friend. Rockman also went to explain how Duo's people had also attempted to find a future for humans and Navis with Cross Fusion as their research, to which Duo asked once more about what Cross Fusion was, showing that despite deeming it from a "flawed-evolutioned" network civilization, Duo still held curiosity over it.
Once more being explained that it was a union between human and Navi, forged from a bond of trust, Duo stated that to a supreme being like himself, their existence was outside of his calculations, and thus had to be deleted. However, Netto and the others woke up, and standing in front of their Navis, refusing to allow Duo to destroy them, mirroring what the Navis had done moments earlier, which again peaked Duo's curiosity to such selfless acts. However, despite being told again that it was because that the humans and Navis were friends, Duo's inability to understand trust and love made him call it something outside of his calculations again.
Left with no other options, Barrel stepped forward and told Duo that he will make Duo understand Cross Fusion, by performing it with Duo, intending to fuse with the Cybernetic God. Netto attempted to stop Barrel, but Duo stopped Netto from interfering, and expressed his interest, asking that if he were to fuse with a lifeform, he would be able to understand Cross Fusion, to which Barrel said that he would. With Colonel also wishing to be with Barrel, Duo took the two, absorbing them into himself, before enveloping everything in a bright light, as Duo seemed to restore Earth once more, perhaps convinced and understanding what it means to Cross Fuse, and having left with Barrel to explore the vast universe.
Because Duo left Earth from 30 years from the past, Duo returned Barrel at some point, after having explored the vast cosmos together.
Powers, abilities, and equipment
Duo is far more powerful than any other character in the series; his powers are almost godlike, to the point that he can be considered to possess omnipotence.
He possesses the ability to separate Navis and operators from Cross Fusion with a mere thought, allowing them to take on physical bodies while in his comet, as well as creating physical forms of giant viruses when he first began his attack on Earth for its erasure. He can block attacks by barely moving an inch and defeating various adversaries at once with just a single attack. Another ability he has in the anime is to edit DNA, leaving the subject with supernatural powers like extremely high intelligence (like Dr. Regal) or the ability to survive and heal faster from heavily damaging physical experiences (like Yuriko). He is also able to give certain humans that he had deemed worthy with his crest, which seems to be able to increase the synchro rating for Cross Fusion, and allow them to see his comet, despite how others couldn't, though it seemed like certain humans like Wily and Jasmine's grandfather were still aware of Duo's presence.
Along with that, Duo's presence and influence in the planet caused a temporal distortion, enabling the past and present to become connected thus allowing Barrel and Colonel to enter the future, or ShadeMan to go back into the past. When Regal was controlling his comet, Duo stopped him because the countdown had ended: Duo stole Regal's bodily energy and reduced him to a skeleton.
Duo has also access and knowledge of highly advanced technology, being able to create Asteroids for humans to use, who are superior to normal Navis, along with Dimensional Chips for the humans' PETs that would enable the Asteroid to materialize in the real world, which Slur was sent to give to humans for the test for humans.
The greatest feat of his omnipotence is when he had managed to repair any damage done to the planet as if it never happened. When he first performing Earth's erasure through the summoning of giant viruses, it was a worldwide phenomenon that had destroyed many cities and ships, but after Duo decided to give humans the test, he withdrew his attack, and all the destruction caused was restored. At the very end on the Stream series, he destroyed the Earth completely along with every non-Crest of Duo holders in it. Then, he undid everything after Barrel and Colonel sacrificed themselves to Duo. This could potentially be tied in with his temporal powers, though, but it is unclear.
The extent of his powers and omnipotence is unknown, however, it may be possible that Duo has limits. Regal was completely sure that his worldwide Dimensional Area would be able to protect Earth from Duo, and even attempted to take control of Duo's comet. However, it is likely that Regal had underestimated Duo a great deal in his arrogance.
- Anger Impact (アンガーインパクト Angā Inpakuto): The attack was the only one used by Duo in the anime. He sends a giant red projection of a face at his enemy. It was powerful enough to easily defeat all of the Cross Fusion team.
Crest of Duo
The Crest of Duo (デューオの紋章 Dyūo no Monshō) is a crest given by Duo to humans in Stream. People with this crest are able to use Cross Fusion. It first appeared in Episode 2. These Crests allow one to control the guard robots inside the ruins of the Creators. Also, when all 13 of Duo's Crests are together, they allow one to have access to Duo's comet and control it.