i finally quit lurking and register
1- My mother once rented an apartment which had a haunted kitchen, at least while she was there. More than once, she walked inside to discover a spot where the temperature was drastically and inexplicably lower, and at least once, something that was laying in a stable position (no way it could have fallen from just wind or being bumped into) was thrown across the kitchen while she was in a different room.
2- Myself, i've had a number of dreams where i would experience some simple, rather uninteresting event, such as standing in line in a restaurant while talking familiarly with a person i did not know at the time of the dream. Several months later, i would find myself experiencing the exact same event several times, exactly as it was in the dream- in the case of the restaurant, it was one i had never been in until i met my girlfriend, who turned out to be the person in the dream, and the restaurant was one with distinctive internal architecture.
3- i live in the Hudson River Valley, near Tarrytown and Sleepy Hollow, and the state of the famed Washington Irving (who set his stories in those towns). Though i've never been there, i've heard many times that Irving's ghost will sexually harass young women (nothing serious, as far as i've heard). Aside from that, the Valley is just really creepy in and around that area. People walking in broad daylight have been suddenly overcome by feelings of fear and apprehension.
4- While riding from a friend's birthday party, i was snapped out of a state of drowsiness by a feeling of 'unnaturalness', and began noticing that the people in the area we (my father was driving) were passing through had a slightly bizzarre cast to their features. Several minutes later, we passed the sign for Indian Point.
5- My grandparents have a property upstate which relies on a septic tank for sewage, and the system has a maintenance tunnel behind the house. One day, the tunnel was open for whatever reason, and i looked inside at the tunnel floor, where sunlight was shining down from above. I saw two or three of what i thought were very large bullfrogs, and wondered at how they got down there. Then i noticed the patterns on their backs, and realized that it was the colour and markings of the pickerel toads which frequent the area in the summertime. Pickerel toads are a little smaller than a kiwi fruit, but these amphibians were about the size of grapefruits. Whether they were large bullfrogs with markings that somehow matched a species of toad (the bullfrogs in this area are an avocado green, whereas the pickerels are primarily tan), or toads the size of large frogs, i can't be sure. However, i did later see one sitting before the garden on the opposite end of the house, so i know it wasn't a trick of light and shadow (it hopped away into the brush when i tried to catch it).
6- If you're a New Yorker within driving distance of NYC, you've at least heard firsthand accounts of the sewer rats. The size of cats, monstrous things with vicious temperaments. A former classmate claimed to have kept one as a pet, though the truth of this is doubtful.
7- Any number of inexplicable technological/mechanical quirks and failures may be blamed upon gremlins. My girlfriend says she is fairly certain there are some living in a tree outside her window.
8- Since childhood, i've been haunted by visions and what i was fairly certain were imagined monsters lurking near my bed. However, in the past year, some of these 'imagined' creatures reached out to me, and i came to understand that they were not harmful, but protective in nature. Their horrific appearance was something akin to that of a gargoyle- designed more to frighten away even more terrible things than to put fear into regular people. As far as i have determined, they are called Darklings or Darkling Folk. At least one has possessed my body to carry on a conversation (speaking in a poorly faked english accent), mostly because he has no body of his own, not even an immaterial one.
A Modern game set in the areas of the lower Hudson River Valley and NYC, possibly crossing into Jersey occasionally, would have a fairly good variety in the monsters. Aside from a variety of ghosts, "monstrous" versions of normal animals, gargoyles (a number of buildings in the city have them), and the numerous devils (including the famed Jersey Devil), one may also easily include monsters which immigrated here from other regions.