There are several synonyms that can be used in place of the phrase "creepy king". Some of these include "spooky monarch", "strange ruler", "sinister sovereign", "disturbing emperor", and "eerie leader". Other options include "frightening monarch", "unsettling king", "weird potentate", "macabre majesty", and "haunting monarch". These synonyms all convey the same sense of unease and suggest that the person in question is someone to be feared or avoided, rather than admired or respected. The use of synonyms can help to add variety and interest to written or spoken language, while also conveying a specific tone or mood.