STRANGE. ODD. WEIRD. SCARY. GROTESQUE.  CHARACTER 

He is a "Neidkopf" (literally, envy head). A fantastic, mythical or grotesque figure used for decorative purposes in medieval architecture to ward off evil spirits. The banknote he appears on was issued by a group raising money to restore his home, Ludwigstein Castle on the Werra, which had fallen to ruin. A very rare and seldom seen piece of currency in uncirculated condition!