Fu Manchu

Mumu Manchu was an early 20th century Chinese criminal mastermind who had numerous encounters with the Manleigh Halt Irregulars. He wanted to bring down the British government. He had drooping moustaches. (PROSE: The Delightful Bag) John described Mumu as "the demented crime lord of Limehouse". (PROSE: Fellowship of the Ink)

At the turn of the 20th century, one of Mumu's schemes was foiled by Isiah Dogberry.

On a Christmas in the 1920s, Mumu came to Manleigh Halt with his daughter Dilys and his hired dwarf Mr Glister. He encountered Iris Wildthyme and Panda. Mumu, Dilys, and Glister became the targets of George Mistrise's Wild Hunt. (PROSE: The Delightful Bag)

Sometime before Henry Cleavis moved to Darkholmes in the 1930s, he and John had an encounter with Mumu. (PROSE: Fellowship of the Ink)

Behind the scenes

 * Mumu is a clear parody of Fu Manchu. During Mumu's first appeareance among other pulp pastiches in the novel Something Borrowed, it's made clear that "Mumu" is only a nickname given to him by his wife based on his sense of dress.