I'm working on designing characters for a game, and the main group of villains consists of characters that have a two-word epithet in the form "The ___" where the word in the blank describes their personality or what they do (i.e. "The Languid," "The Reminder," etc.)
One of these characters acts like a trickster/jester, but in an uncanny and rather malicious way. (Think Batman's Joker or The Legend of Zelda's Happy Mask Salesman). Is there a word to describe this type of person? Basically I'm looking for a noun or adjective that includes meanings or connotations of "strange," "unpredictable," and "malicious."
Some near misses include "uncanny," "fickle," and "capricious." The latter of which comes closest, in my opinion, but doesn't quite encapsulate the connotation of malice or foreboding.