That's actually a medical/psychiatric diagnosis. I don't really think it applies here (or maybe it does, I don't know, I only know that you can't just throw that casually at run-of-the mill creeps).
Bill Cosby for instance could possibly be considered one. His also seems more methodical. What's worse: 60 possible rapes spanning decades or 60 possible rapes spanning a year?
I'd love to know what you mean here, because I can't see how this follows anything.
Life pro tip: just say them in a calm, explicit and direct manner that you are not interested in receiving their visits and information from them. They respect that. They might show up after a year or so, just to check out if this is the same family living under the number.
They're pretty organised and respectful in what they do, so polite and direct works best.
You have never seen slow walkers move that fast from the building.