Theory:Hiro Nakamura

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The following fan theories are about Hiro Nakamura.

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Theories

Theory	Citations	Notes
Hiro's powers resulted from mutations in his grandfather's DNA. These mutations were caused by the atomic bomb dropped on Hiroshima.	Hiro's grandfather was a survivor of Hiroshima and died of cancer. (The Crane)	- In an interview, George Takei strongly implied that Takezo Kensei is Hiro's ancestor. He says that through that legendary samurai, he is bringing a lot of good DNA to this role. This means that Hiro's DNA mutations were obtained from Kensei, not the atomic bomb. + Takezo Kensei didn't turn out to be much of a hero after all. - This could be because of Hiro's manipulation of the past (kissing Yaeko).
Hiro did not kill Sylar because he used Ando's sword	None.	+ Isaac's comic showed Hiro stabbing Sylar with the Kensei sword. + Isaac's paintings did not always come true because of changes made by the characters. - Isaac's paintings give little context to what they show. The comic shows Sylar getting stabbed but not necessarily killed. It may be that the comic never meant to foretell Sylar's death.
Hiro's powers have not fully developed. When they do he will be able to summon anything from anywhere to any point in time.	None.	+ Many of the powers take practice and time to develop. • Future Hiro did not display such an ability. Had he possessed it, he could have brought Future Peter to him and Ando, rather than traveling to Las Vegas, or simply summoned present-day Hiro from the Homeland Security building. He may have not fully developed his powers in the period of five years, however. • Matt Parkman also didn't appear to have fully developed his powers in the dark future, possible due to never meeting his father.
In time, Hiro will be able to travel to a time and place by focusing on a picture of it.	None.	:+ In Genesis, Hiro is looking at a picture of New York and the next moment he is there.
Hiro did not actually change history when he time-traveled to ancient Japan; events as they are unfolding now are exactly the events that occurred in the first place.	None.	+ Hiro traveling to the past and becoming Takezo Kensei was a predestination paradox. The reality never changed. In the stories that Hiro was told by his father, Kensei was never a gaijin, it was always Hiro. He was destined to return to feudal Japan and become the hero. - However, Hiro's first intereference in feudal Japan is to disrupt Kensei's planned ambush of the bandits he was hired to protect the village from. We see that this action is directly connected to Kensei receiving his famous sword and meeting the swordsmith's daughter (who was angry at him only for abandoning the village to it's fate, which was Hiro's fault). It seems fairly probable that before Hiro's intereference, it was indeed this incident that set Kensei on the path to heroism. Indeed, Hiro himself points out that he 'broke history'. + Yaeko told Hiro that everyone will know the story of Takezo Kensei. She likely took license to make the story the way Hiro remembered it. Plus, in her mind perhaps, Hiro still saved Otsu as the story originally said. + The "Battle of Twelve Swords" fits more into the context of Hiro's time-stop ability than Kensei's regeneration; if Kensei had gone into the battle, it is unlikely he would have simply disarmed the opponents. + This could explain why the depictions of Kensei in the Sword Saint documentaries looks less like Kensei, and more like Hiro.
Every time Hiro time travels he causes a catastrophe such as the bomb that explodes in New York and the plague that Peter and Caitlin saw.	None.	+ In the graphic novel String Theory it shows he went back in time to stop Sylar from getting Claire's power so he could be killed. By doing so it only made Peter the exploding man instead of Sylar and the explosion still happened in Five Years Gone because Hiro teleported forward in time and it prevented him from stabbing Sylar. + Hiro made it worse when he accidentally teleported to feudal Japan. There he met his childhood hero Kensei/Adam. He couldn't believe Adam was a drunk, pillager, and only thought of himself. So he turned him into the hero he read about but he betrayed him by kissing his princess. During the fight and before the explosion, Adam told Hiro he would pay for what he did. + Bob said Adam was the first and he said Adam wanted to help the human population by ruling them through enslavement and punishment (or something to that degree). Maybe if Hiro hadn't gone back to Japan and met Adam and then accidentally betrayed him none of the future Peter and Caitlin saw would exist because Adam wouldn't want to seek revenge for hundreds of years. Adam may the one responsible for the release of the Shanti Virus on the world. If he can heal from the Shanti Virus, then he would have nothing to fear from an outbreak. - One of the side effects of the Shanti virus is the inability of evolved humans using their abilities. Thus, Adam would not be able to use his power if he came in contact with the virus. • In the episode Truth & Consequences, Mohinder finds out that Claire's regenerative blood is a cure for the virus. So that means Claire, Adam, and maybe Peter are immune to the effects of the virus. • Claire's blood is only a cure for the virus when combined with Mohinder's antibodies. It is possible that someone with the ability of regeneration could resist the effects of the virus much longer than someone without (as it is not explained exactly how the virus negates abilities; if it is damaging whatever cells are responsible for powers, constant regeneration may be able to hold it off, possibly indefinitely, in a "dormant" state), but unless we learn more about how both the virus and powers work, it is impossible to say whether Claire, Adam, or Peter could survive.
When Hiro bumped into himself as a child he created a rift which will present itself later in Volume 3.	None.	+ Touching a previous version of yourself is a paradox which may well cause a rift. - Mere contact (physical or otherwise) with a previous version of oneself wouldn't necessarily cause a paradox. Only contact which would alter events in a manner which would prevent the contact would do so. This contact could have altered some events, but likely not enough to prevent the present Hiro from going back in time and making the contact in the first place. - Dark Future Hiro didn't seem to consider that when he was about to send his past self and Ando back to their present. + He might not need to touch an object to teleport them.
Hiro can travel between universes.	None.	+ Hiro has gone to futures that did not happen. They could be futures of alternate universes. - It is possible that the future that he visited was a product of him being "out of the equation" as he was able to prevent Claire from being killed, but didn't stab Sylar (as he wasn't there in that timeline).
Hiro Nakamura is brothers with Sylar, Nathan and Peter Petrelli.	We don't know who Sylar's father is, so he may be Arthur Petrelli. While Hiro's biological mother may actually be Angela Petrelli, since we know she slept with Kaito Nakamura.	+ Angela's power is similar to Precognition, while Kaito's ability was probability prediction. So then Arthur's power may also be related with probability, since two of the four parents can already predict the future in some kind of way. + All of their children would have similar abilities as well; Sylar (Intuitive aptitude) and Peter (Empathic mimicry) are related, while Hiro (Space-time manipulation) and Nathan (Flight) are also very similar. - I don't think flight and space-time manipulation are similar, also Hiro seems younger than Nathan. Mrs. Petrelli having a bastard child like Sylar before getting maried and having two kids makes sense. Giving birth to an Asian baby would probably have wrecked her marriage. Nathan would remember his mom being pregnant with a second baby. + These four characters seem to interact and affect the Future far more than any other Character in the entire series. + In the episode The Butterfly Effect When talking to Sylar Angela Petrelli says to him that she is his mother. - In "Behind the Eclipse: Week 2", authors Aron Coliete and Joe Pokaski hint, that we will find out the power of Hiro's mother by the end of Volume 3. So since we already know Angela's power, she is probably not Hiro's mother.
Hiro did not kill Ando in "Angels and Monsters" because before he 'stabbed' him, he froze time, told him to fake his death or warned him that he must stab him in a non-lethal spot.	Early on in "Angels and Monsters" it shows Hiro manipulating time/space without the usual warning or notification that he is doing so	+ Hiro has never displayed such 'bad ass'-ness before. + It seems highly unlikely he would kill Ando after their touching moment in the previous episode.