I probably seem familiar because I was in your dreams. I like to look in to see if people are having nightmares, and if they are, I destroy the source of it with the dream fighting powers that I totally have. Only works while three layers deep or more (limbo included, though I prefer not to go that route due to the inherent risk of losing touch with reality).
On occasion, the dreamer has scarce recollections of a black, caped figure. That's likely what you're feeling; don't worry, though, it's totally normal.
As for who I am, all I have to say is nanananananananananana