Granted the title of Venerable in 1985, Dr. José Gregorio Hernández is not too well known in non-Spanish-speaking countries.
Not even Google seems to know who “Señor Misterioso” really is. That might be one of the reasons why he’s been deemed as, precisely, “misterioso”. Some compare him to “the most interesting man in the world” (the former “Dos Equis” guy), and bloggers and social media users seem to be intrigued by his impeccable white glow-in-the-dark suit, fedora hat, perfectly well-groomed mustache, and seemingly expressionless facial rictus.
Most of the time, “Señor Misterioso” (a small figurine some people have been able to find offline, as Amazon only offers air fresheners featuring his image, with his hands invariably behind his back) is seen in pictures wandering around the world, as those who treasure the figure carry it with them when traveling, in order to (superstitiously) “bring danger and mystery to their mundane experience” (as read on the package of the “Señor Misterioso” action figure).
Needless to say, those who don’t know who “Señor Misterioso” really is just think of it as a “cool” object, some sort of hip dashboard figure to substitute for Elvis or the classic Hawaiian hula doll.