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's grandfather is Patient Zero, the first of the evolved humans according to Chandra's research.	Hiro's grandfather was a survivor of Hiroshima. (The Crane)	+ His exposure to radiation could have caused him to develop special powers. Hiro's grandfather knew that Hiro would one day develop powers and introduced his grandson to comics fostering dreams of special abilities. - Radiation gives you cancer, not powers; otherwise Mrs. Sprague would have powers. • On the other hand, Hiro's father likely received a much smaller dose than Mrs. Sprague presumably got. Cancer is a type of genetic mutation, and Chandra Suresh believed that most powers first presented themselves as genetic mutations. + Radiation is a common cause of super powers in comics and movies. - In Parasite, Mohinder reveals that his father called Sylar Patient Zero.
Hiro was adopted by Kaito Nakamura.	Claire was adopted by Mr. Bennet while waiting for her powers to manifest. (Company Man).	+ Hiro could have been adopted by Kaito while waiting for his powers to manifest. - It seems inconsistent with Japanese culture to offer leadership to an adoptive child over a biological child, but that could be a way to cover Hiro's non-biological relationship to Kaito or a reflection on latent sexism in Japanese culture. - Hiro's powers manifested fairly late in life, and would be extremely difficult for Mr. Nakamura (or anybody else) to detect. - In an interview, writers Aron Coleite and Joe Pokaski stated that Hiro is Kaito's son. • That doesn't mean that Hiro is his biological son. Claire is always referred to as "daughter" by Mr. Bennet, and she's not his biological daughter.
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 didnt appear to have fully developed his powers in the dark future, possible due to never meeting his father.
Hiro is Angela Petrelli's biological son.	None.	+ Angela says to Matt Parkman that she has not been sleeping with Kaito "for a long time," implying that she may have at some point in the past. • It is not stated when Angela and Kaito potentially slept together, so it is impossible to coincide it with Hiro's birth. - Nathan is considerably older than Hiro, and would have noticed if his mother was pregnant. If he did notice she was pregnant, why isn't he questioning about a possible sibling?
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.	+ It seems unlikely that Kensei would have become the hero of history without Hiro's guidance, as Kensei said himself that Hiro is like his conscience. + 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.
Hiro's power needs a level of concentration. If Hiro has a bad mental state he is unable to concentrate, so his power doesn't work.	When Charlie died, hiro was upset and wasn't able to use his power.	+ He needed the sword to focus properly. + He was not able to use his powers when he was inhaling opium. (Out of Time)
Everytime 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 said he went back in time to stop Sylar from getting Claire's power and 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 him. + Hiro made it worse when he accidently teleported to fuedal Japan. There he met his childhood hero Kensei/Adam. He couldn't believe Adam was a drunk, pilleger, and only thought of himself. So what did he do 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 accidently 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.