All the monsters-Z.
If your name starts with "Z", you quickly learn in school what an unlikely and unpopular letter it is. Do all children identify with the first letter of their first names? Do Davids feel for "D"s and Steves feel for "S"s? It was obscurely depressing to learn, when I was 8 or whatever, in The Phantom Tollbooth, that the reason nobody used "Z" was it didn't taste very good.
There's only one "Z" monster--and, like the name "Zak", zombies became popular in the last decade. They are, in many ways, a symbol of that decade, and, like all popular monsters, a symbol of what people at that time feared in other people. So I wrote about them when discussing the Zeroes in my last book:
In movies, zombies were the most popular monster. They are unusual, among monsters, for being inferior to their victims and winning only by weight of numbers, and for having no brains, but wanting to eat them.
Night of the Living Dead is a really good movie, so is that one where they're in a shopping mall but man oh man am I sick of zombies. I think I'll be ready to hear about them sometime around 2020.
In hopefully unrelated news, Frank Frazetta died today. Considering the recent weirdness with his family and his illness and his possibly going and fucking up his old paintings, this may not be the worst news (he hasn't been all there, apparently, for years) but it is a good time to remember that he was very very good, and did things with lush color and movement that no other artist ever had before, in any genre or at any time, and that it was worth having all those dead-eyed, sallow skinned, constipated, overrated Italian Renaissance painters and fiddly, brown-obsessed 19th century Orientalists if it meant that one day the bloodline would result in Frazetta. He was the Muad'Dib of the main Western line of painting and, along with Vermeer and Velasquez, is one of the few things that justifies its existence.