Naenia is a mysterious ethereal entity from Jun Mochizuki's The Case Study of Vanitas. As a member of Charlatan, Naenia works alongside her colleagues, invading the subconscious of Vampires in order to inflict them with a Malnomen by distorting their true names. It is not presently known who Naenia is or what her motivations for doing so are.

Spoiler

Later on, it's revealed Naenia is the malmomen of the first queen of the crimson moon.