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Perplexus Anomalous is an Italian peculiar cartographer who is most known for creating the Map of Days, a collection of maps that show the location of every loop throughout the Peculiardom. Not only was he a cartographer, but also a philospher, and great thinker, as Millard admires him greatly. Perplexus Anomalous's name is on the hard cover addition of Hollow City.

His name, Perplexus, is most likely an alias, as the name is derived from the word "perplex", which is defined as 'To make complicated or confused as a matter or question'.