We are getting so close to Detective Comics #27 now that we're going to ramp things up this week. By Friday, I guarantee we'll see a new pointy-eared hero make his debut. To the [spoiler]mobile!
This month, a homage to the Yellow Peril trend of the 30s, which started well before Japan and the United States went to war. A truly awful manifestation of the West's fascination with the Orient in this period, and as we'll see consistent across all of DC's (and others') books. At least Zatara is up against furry-hat-wearing Mongols; that's fairly new.
This enemy may have forgotten his shirt, but he never leaves home without his Fu Manchu. That's a Yellow Peril rule. I could also have gone with a panel from The Golden Dragon strip which offered a monthly dose of evil orientalism. The fact I had a choice is damning, don't you think?
This issue actually features an adaptation of a Fu Manchu story that uses the pulp prose with illustrations. You can't get more Perilous than that.