Answer:

riddler

Answer	Crossword Clue
RIDDLER	Batman foe
RIDDLER	The ... ("Batman" villain)
RIDDLER	Perforator.

RIDDLER	Rebus propounder.
RIDDLER	Enemy of Batman
RIDDLER	"Batman" villain
RIDDLER	"Batman" villain, with "the"
RIDDLER	Batman's foe, with the
RIDDLER	Villain whose alter ego is Edward Nigma