What is it called when a person likes skulls?

A person who has a fascination with skulls may be described as a "skull enthusiast" or could be said to have a "skull appreciation." This interest can be part of various subcultures, such as Gothic or macabre aesthetics, and may also relate to themes in art, fashion, or symbolism. The term "memento mori," which means "remember that you must die," reflects the cultural significance of skulls as reminders of mortality.