What makes a demon such a genius? It is not that she is so very smart. “Genius” is the term used for a hybrid being who is composed of animal parts. A popular one in Ancient Egypt combined the form of a hippopotamus, lioness (or other big wild feline), and crocodile. This form is used for a number of entities including Taweret (“the Great One”), Ipet and Reret.
The sketch showing a close-up from this magic ivory wand makes it clear. Note the feline head, hippo body, and crocodile on her back. This particular one acts as a protective demon, as show by the snakes coming out of her mouth and the butcher knives she holds.
While that genius is generally helpful, the same form is used for Ammit, (the “Devourer” aka Ammut), a demon who was more feared. She waits to eat the heart of those who do not pass the weighing of the heart. Note how Ammit appears with the head of a crocodile, forepart of a lioness, and hippo butt. In this image from a prt m hrw (aka “Book of the Dead”) in the Louvre, she appears really relaxed!