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"Wow, are you a flying blazing skull?!"
"How are you alive?"
"How can you talk?"
"You don't have eyes… how can you look at me?"
"Hey, your fire doesn't burn!"
"But it's warm…!"
"Can I hug you?"
The little kids began to pester Belphegor the most. To them he was really a strange being. At least the others looked mildly humanoid, but Belphegor was just a giant floating skull in the most literal sense. And he was covered in red flames that didn't burned when they touched him. In fact he was very smooth when they touched his skull. He actually kept himself rather clean and always took warm baths of milk to keep himself fresh and with all the calcium he needed.
Check "The Protagnist's Sister Is Actually the Strongest"!