Saygram said:First. Warning. Big (MASSIVE) spoilers below. If you haven't read the manga until chapter 133, stop right now and read no further.
So… I've spent the last couple of evenings reading manga and one thing puzzles me. Could it be that Kou, is another naturally born half vampire, same as Nazuna?
Let's think. His half vampire state surprise to other vampires. At first I thought it might be the result of his relationship with natural half Nazuna. As explained by Anko (Miss detective, if anyone forgot) in Chapter 96, the mixture of strong emotions worked in such a way that Kou tricked his brain and made a temporary transformation. Later, the theory was supplemented with the fact that transformation also occurs due to physical pain and bleeding. But is it possible to turn into a vampire and then return to the human state? (another Araragi?). Moreover, during the transformation, Kou is able to fight even a strong vampire. I'm talking about the encounter with Susuki in chapter 119. He even can destroy the entire building, the other vampires were very surprised, so I can assume that this is not the norm. Not to mention the quick attachment of the severed arm.
This may reminds a bit of situations of vampires who, under special circumstances, went berserk. I'm talking about the vampire who attacked Akira in chapter 38 (he was starving) and the Miss detective's father in chapter 81 (he unknowingly touched an object that was extremely important to him before the transformation, which as we know weakens vampires, but can also kill them). Kou also during the transformation almost completely changes his personality. Like it happened during fight with Mahiru in chapter 103. Yeah, all this should be explained by the fact that the Nazuna regularly feeds on the Kou and she is natural half. But what if, all of this is another Kotoyama bait?
Remember origin story of Nazuna? How we were bait in chapters 59-60 that, it was none other than Nazuna who could be turned into a vampire by Kabura and vice versa. That's how it was presented, but in the end, the Kabura told her story. So from chapters 63-64 we know that Kabura was turned into a vampire by Nanakusa Haru, who was a vampire and that Nazuna was the daughter of Haru and an ordinary human. So a naturally born half vampire. Someone will say yes. So what? Here I will go back to chapter 57 when Nazuna told Kou about her oldest memory, when she woke up in her room. We know that this is also the moment when she first met Kabura, who took care of her after the death of her mother and father. Nazuna looked exactly the same as she is now, but she had no memories or knowledge, she couldn't even speak. She was basically like a newborn baby. So could it be like this? Nazuna was born, for some time (maybe 14-16 years, physically she is not that much different from Kou) she lived as a human, but then she turned into a vampire and lost her memories as a result. As the vampires explained before, transformation is like being born again. Human dies and vampire is born. Because of this, they lose memories of their human lives over time. Perhaps in the case of a naturally born half vampire this process is more extreme or rather faster. That would explain a lot of things. For example, how Kiku obtained the item that weakened Nazuna in chapter 126. In theory, this shouldn't exist because Nazuna was never human, or was she? Kou also loses memories as a result of his partial transformation. Perhaps the transformation of Nazuna was also similar? And finally her human part died completely and only a vampire remained.
Another thing that puzzled me was Kou's behavior during the transformation control training in chapters 107-108. During the fight, he repeated that he must be a good boy, that he must go to school. Isn't that weird? Maybe somewhere inside he remembered a time when he was trying to be a "good boy" or "good student". But maybe this thought was suggested to him by someone. Maybe by father who was a vampire? Maybe something similar has already happened in the past but Kou doesn't remember it?
In Chapter 130, we learned that Kou's mother is raising him alone, she works at night herself (as hostess in the club, I understand) and she divorced her husband because he was supposed to cheat on her. Isn't this job is just too good setting to meet a vampire? But as we know from the example of Nazuna mother, a vampire can also fall in love with ordinary human and have children. However, if what Susuki said in chapter 121 is true, if a vampire falls in love with human and drinks blood, human will die. What could such a potential vampire do? He didn't want to risk the death of his beloved, so he fed on others, which his unaware wife could consider as a cheating. Or that's just fake cover up presented to Kou. In fact, his father might have removed himself on purpose to protect his wife and son, and since he didn't know all the details, he assumed that Kou was not a vampire and wanted him to live a peaceful life.
So what do you think? Kou is another natural born half vampire? Maybe that also explains the fact that his blood is supposed to be so super tasty.
Or maybe I'm just another dude who got too excited and now thinks too much.