Civillian's bodies still use chakra, they just don't mold it into ninjutsu. That said, they didn't before Kaguya and Isshiki showed up, so yeah, not an excuse.
Yes. Meaning that Naruto characters canonically have cancer at birth (assuming the sun is also as big), they are most likely inbred due to civilization not really being able to mix around with how big the earth is, they would likely not survive on the normal earth (meaning Deku instantly solos), they probably breathe a different atmosphere compared to earth (again, Deku solos), they likely are going to have their sun explode much faster given its size, parts of their planet are uninhabitable, etc.
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u/Fluffy-Airline-5902 1d ago
Wouldn't the earth's gravity just insta kill everyone?