I enjoy metal. A lot. And there are a few bands that have gimmicks to make themselves stick out. Or maybe they're not really a "gimmick" per se and they exist only to **** around and/or piss people off.
So, here are a few that I can think of.
Gimmick: Pirate-themed power metal/folk metal
Gimmick: African Grey parrot as the vocalist in a death metal band. Lots of puns.
Song: Bird Seeds of Vengeance
Gimmick: Not really a gimmick, but.. they play metal on cellos. And they're friggin' amazing live.
Song: Stairway to Heaven
Soo.. anyone else want to share theirs? Doesn't matter what genre it is. I like all varieties of music.