oh! yea! he's a demon dullaha, he used to be a knight but ended up corrupting and committing crimes, when he died his guilt and his safistic nature separated into two minds, the headless without flame has a knighly honorable personality, and the head with flames + teeth is sadistic and cruel.
the pumpkin one is just a container of his powers, it happend to develop its own personality tho and now just happens to be the main personality that they appear with