SCP Foundation

Essentially, an anartist with a fondness for cheesy slasher films takes a crack at creating an urban legend of his own design in the same vein as "Cropsey" or "Bunny Man". What he does is basically kidnap someone with retrograde amnesia and debilitating psychosis, and then go about doing some manner of brainwashing until he is, for the most part, completely subservient to him.

They then go about giving them a number of anomalous capabilities that fall in line with slasher movie tropes, such as being able to mark their "territory" (ie, Jason Voorhees with Crystal Lake, Haddonfield in Halloween, etc) which, while they still reside in it, allows them a considerable degree of influence within it. For instance, they have the capacity for short-range teleportation, similar to how killers manage to catch up with their victims despite never going any faster than a mildly brisk pace, or subconsciously influencing their victims into becoming progressively more reckless and imprudent, highlighting how the victims in aforementioned movies are renowned for their stupidity.

However, due to the nature of the SCPs mental state, they do happen to have moments of lucidity. Within this small time-frame, they'll try their best to actively ignore the people they were supposed to be pursuing, giving them an opportunity to escape, or actively setting up things in their favor to either allow them to flee, or potentially kill him, so the SCP can finally be free of their suffering.

There is also going to be an addendum showcasing how the SCPs creator was capable of controlling them, which involved a mixture of soothing music and talking to it in a quiet tone. It was what they considered the easiest and most convenient work-around, since most of the time people aren't going to try and convince this hulking monster that they should leave them alone in a nice, quiet voice. Researchers would eventually discover this (somehow), then use it to make containment of the SCP easier.

This one is considerably less fleshed out, but one that I'd still like to do something with. Basically, a species from another dimensions planet is dying out, and they are trying to conduct a transdimensional exodus to another universe in an attempt to preserve their species. However, the technology they are using is flawed, and is really only capable of transporting what is essentially their "soul", and not their physical body.

This is, understandably, a traumatic experience for them, and their immediate reaction upon arriving to Earth is to essentially vacuum up the nearest available solid matter to serve as a crude, rudimentary vessel for their non-corporeal subconscious, shaping it into their own likeness. What this basically leads to is a number of traumatized, extra-dimensional golems wandering about the planet, some of which have been so completely broken from their experience that they've essentially been reduced to mindless beasts. Despite their anguish and initial confusion, they eventually begin to slowly band together in order to both attempt to reconstruct their civilization on Earth, whilst also looking for some way to re-create their old physical bodies.

Obviously, the Foundation wouldn't be too fond at this at first, attempting to stifle the recreation of some alien society on their own turf. After a number of skirmishes, none of which really happen to be beneficial for either side, the two eventually make a pact. This pact means the remnants of the civilization will willingly go into containment, in exchange for the Foundations protection, and its assistance in developing a method in recreating the old bodies of its collective members.