Naberius appears as a three headed dog or a raven. He has a raucous voice but presents himself as eloquent and amiable. He teaches the art of gracious living. He has also been depicted as a crow or a black crane.
Concerning his name, it is unclear if there is an association with the Greek Cerberus. It is said that in 1583, Johann Weyer considers both of them to be the same demon. He claimed: "Naberius [Naberus], alias Cerberus, is a valiant marquesse, shewing himselfe in the forme of a crowe, when he speaketh with a hoarse voice: he maketh a man amiable and cunning in all arts, and speciallie in rhetorike, he procureth the losse of prelacies and dignities: nineteene legions heare (and obeie) him."
Other spellings: Cerberus, Cerbere, Naberus, Nebiros.