The Monkey King's main weapon is his iron cudgel. It can grow or shrink to any size he wishes. Most of the time, it's portrayed as a red staff with golden ends. Katsuya Terada's Monkey King was one of the first I've ever seen where his pole actually grows and shrinks. Taking a cue from Terada-san, I've given my Monkey King an impossibly HUGE Monkey Pole. He's naked, but I didn't think to sketch in his Monkey Dong.