- Not to be confused with this subject's son, Bayon II.
Bayon (バイヨン, Baiyon?) is one of the antagonists of The Promised Neverland during the Goldy Pond arc. A demon who belongs to the group of Demons known as the "Poachers". He is the owner and administrator of Goldy Pond and manager of the Grand Valley Farm. He takes children from his plantation to use them as game for his hunting.
A millennium ago, Bayon was in a meeting with several demons discussing how they should consume orphans when they are recently forbidden to do so due to the treaty. As the demons complained, Bayon came out with the solution of building the farms to "cultivate" the young of the humans so to satisfy the demons' need of consuming human flesh, as well as to comply with the treaty. Therefore, Bayon's solution was accepted and included as part of the treaty.
Around 200 years after the establishment of the farms, Leuvis received the news of Bayon getting elected as an investor and manager of several farms, as he openly mocked Bayon and warned him off not to get carried away by his high ranking positions. Seemingly unoffended by Leuvis' comment, Bayon agreed with him, as he rhetorically questions on how it does not matter to him if he indeed gets carried away by his rank. Years later, Bayon, Leuvis, Nous, Nouma, Luce and a few other demons overrun a deserted human town under Bayon's name, which they soon turned into a hunting ground as orphans who either have been bought or stumbled into the place by accident were thrown into the hunting ground for Bayon and his team to hunt.
Bayon especially has long hair like most other demons, but his mask incorporates two dark pits side by side which resemble more conventional eyeholes.
Bayon originally tried to hold true with the pact to not hunt humans but found the cattle-grown food dry and tasteless. It was only after hunting his first human in a millennium that he found his food tasteful again and decided to start his secret hunting grounds, not caring whether his prey could fight back. He's a bloodthirsty murderer who can't enjoy life without hunting and killing his food before eating it. It's only in his final moments when he is close to death that he rediscovers the joy in hunting prey that actually fights back and can potentially kill him and laughs manically.