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All humans in Naruto have Chakra, Naruto told this to Kawaki in Boruto. Animals have Chakra too, we've seen dogs, snakes and frogs have Chakra.
Even trees in Narutocan have Chakra, Kakashi pointed this out to Naruto when Naruto was training to create the Rasenshuriken.
There are even metals that can have Chakra.
However, the only things most Genjutsu can affect are things that have Chakra in their cranial nerves. This is because of a unique biology that exists only in Naruto, the Chakra Network System, which flows throughout the body delivering Chakra throughout it and does not exist in pretty much other works of fiction. There aren't verses that have a unique network system that goes through their body delivering energy (which is also their life force since they die if they run out of Chakra).
A lot of people believe it is similar to the human respiratory system, but that's wrong since this system literally wraps around the organs throughout the body like strings. It even has 361 nodes throughout it.
Even trees in Narutocan have Chakra, Kakashi pointed this out to Naruto when Naruto was training to create the Rasenshuriken.
There are even metals that can have Chakra.
However, the only things most Genjutsu can affect are things that have Chakra in their cranial nerves. This is because of a unique biology that exists only in Naruto, the Chakra Network System, which flows throughout the body delivering Chakra throughout it and does not exist in pretty much other works of fiction. There aren't verses that have a unique network system that goes through their body delivering energy (which is also their life force since they die if they run out of Chakra).
A lot of people believe it is similar to the human respiratory system, but that's wrong since this system literally wraps around the organs throughout the body like strings. It even has 361 nodes throughout it.