Apophis
Apophis was the Egyptian demons of chaos who was also the enemy of Ra. He lived in the underworld and he was the one who if Anubis says you aren't worthy to go to the afterlife he would send you with Seth and Apophis.
Ammit
Ammit is a female demons and she is found in the book of the dead and plays an important part in the Hall of Ma'at. She eats hearts and souls. She has the head of a crocodile and the body of a lioness and the legs of a hippo.