This is probably a horrible idea, but here goes: A humanoid SCP that is physically completely normal, and is more or less normal mentally, but whose unconscious mind has both potent precognitive abilities and an agenda. He has no conscious access to these abilities or knowledge of the agenda, but has his actions subtly influenced to just repeatedly be "in the right place at the right time" to further whatever that agenda is.
He came to the attention of the Foundation after repeatedly being involved in SCP-related incidents, seemingly by accident, due to minor, innocuous deviations from his ordinary routine (oversleeping, being early or late, attempting to find a new restaurant, etc). When questioned, he does relate a history of seemingly convenient timing, and can point to many incidents in his past where a small decision had a more profound (and unexpected) effect, though by no means always a positive one.
Since his containment, he has been involved in a number of containment breach incidents, in each case avoiding death by a fraction of an second/inch, though still spending a lot of time in intensive care. Also in each case, he just happened to, by his presence and/or actions, cause a noticeable change in the outcome (increase/decrease in fatalities, ending/prolonging the breach, etc.).
He does have brief flashes of insight, possibly moments where his unconscious ability surfaces for an instant. He's very fatalistic, and is certain that he has less than five years to live, and that his death will be violent, painful, and extremely undignified, but will also have some major effect.
I know the idea's not particularly scary (other than the "what is his agenda?" uncertainty) - I figure the only real function of an SCP of this nature would be to die in somebody's story, but there's something appealing to me about a character created solely to be used and destroyed as a tool for someone in a way I can't predict. The creep factor could potentially be enhanced by playing up the sympathy aspect - this is an ordinary guy who's being dragged along for the ride by a part of his mind that has incredible power, suspect motives, and no concern for his safety or feelings beyond how they can be useful to its plans. There is something inherently scary about the idea of having no real control over one's actions or future.
So, does this idea have any potential, or should it die a messy death before it can pollute the wiki with its horribleness?