Running a group through a Seeker arc, and one of the PCs is based off of Santa Claus, down to the outfit, naughty/nice list, & bag of candy.
Well...one of the modules, Rasputin Must Die, takes the party to 20th century Russia, about when & where a Russian version of Santa Claus is developing that's quite similar in appearance to the US version. (According to modest research, that is.)
So "Father Winter", "Grandfather Winter", et al, who was in Russia once known as a snow demon, in PC form lands in Russia alongside the usual motley murderhobos, much to the terror & delight & moreover confusion of the various NPCs.
The PC, Nick, who does not know he resembles some earthly Santa Claus, gets just as baffled, especially by the way children & wounded reach out to him for comfort. At least once I had the bad guys call out a bonus for whoever killed such a famous figure, to make up for the reluctance of others to harm their childhood icon. :)