A brutal and insane man wearing no pants whatsoever (JoJo's Bizarre Adventure, called Iced in the US
game for). He holds his lord in high regard, and if you make him attack a figure that looks exactly
like his lord, he will
go kung-fooey on your ass and beat it until you are
fubar but still living, and there's no stopping him when he's like this. He's THAT brutal, insane, and unstoppable.
Also, you could call any pantless (religious) zealot a Vanilla Ice.