Munchkin
-- Convoluted hint at his Icelandic heritage (Munchkin poster -> historically incorrect horned helmet -> vikings -> Old Norse -> Mau speaks Icelandic)
Morose, macabre monologues
-- He's a bit depressed and macabre and has a tendency to have half-formed conversations with himself, or talk to the thin air when there's something dramatic that needs to be said
Misanthrope murderer
-- Actually hates most people, has been the cause of death of many
Maidenly multiplex
-- I could make some really perverted take on this which leads back to the male gender, but eh. Mauja the White Queen.
Mongrel mate
-- ""Diego" as a generic name or term for a Spaniard is documented from around 1615, and "dago" is used as such still in the 19th century. By the early 20th century, the term "dago" became an ethnic slur chiefly for Italian Americans, besides also for anyone of Hispanic or Portuguese descent."