Belphagor

Belphagor (as per your search) or Belphie is one of the main characters in an otome game called "Obey Me! Shall We Date? (One Master To Rule Them All!)". He is one of the seven demon brothers/rulers of Devildom (hell) and the Avatar of Sloth. Being the Avatar of Sloth, he is very lazy and can sleep anywhere, but, rather than being sloth themed, he is actually cow themed. He is the twin of the sixth born, Beelzebub. He hates humans except of MC/ Y/N (though he hated them from the start). He also hates the soon to be demon lord, Diavolo, and his oldest brother, Lucifer, for being a literal dog towards his lord (Diavolo), this is proved when in chapter 16, it is revealed that Lucifer locked Belphie in the attic since he did not respect the lord's ideas of the Exchange Program and he (Lucifer) lied to his 5 brother telling them that Belphie went to the human world. Belphie somehow could listen what was happening in the HoL (house of lementation). He loves sleep, Beelzebub, and MC. Though he killed MC by choking them later for freeing them from the attic (not a good way to thank them at all), he later started developing feelings for them (what do you expect? It's an otome game afterall).

Though I think you probably were trying to search Belphegor/Belphie.

Belphagor (as per your search) or Belphie is one of the main characters in an otome game called "Obey Me! Shall We Date? (One Master To Rule Them All!)". He is one of the seven demon brothers/rulers of Devildom (hell) and the Avatar of Sloth. Being the Avatar of Sloth, he is very lazy and can sleep anywhere, but, rather than being sloth themed, he is actually cow themed. He is the twin of the sixth born, Beelzebub. He hates humans except of MC/ Y/N (though he hated them from the start). He also hates the soon to be demon lord, Diavolo, and his oldest brother, Lucifer, for being a literal dog towards his lord (Diavolo), this is proved when in chapter 16, it is revealed that Lucifer locked Belphie in the attic since he did not respect the lord's ideas of the Exchange Program and he (Lucifer) lied to his 5 brother telling them that Belphie went to the human world. Belphie somehow could listen what was happening in the HoL (house of lementation). He loves sleep, Beelzebub, and MC. Though he killed MC by choking them later for freeing them from the attic (not a good way to thank them at all), he later started developing feelings for them (what do you expect? It's an otome game afterall).

Though I think you probably were trying to search Belphegor/Belphie.