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.
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.
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.
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 is the hooded killer.	None	+ Kaito seemed very suprised when he realized who the killer was. Certainly if they had betrayed Kensei in the past it would not seem all too shocking. - Most people get a shock before being murdered. + This would explain how the killer was able to attack Kaito and escape unscathed. And perhaps in the past Hiro learned a new application of his power to make himself seemingly invisible to carry out the attacks on Angela Petrelli. - It is very unlikely that Hiro would kill his own father.. - Especially since he can't even bring himself to kill people that truly deserve it.
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.