Would the Real Villain Please Stand Up

Set after KH:3D. After throwing a mad party in Radiant Garden, one of the new Restoration Committee members stumbles upon a mysterious evil that has begun stalking our heroes for some unseen reason. All they can tell is that whoever it is wants to stir up trouble, and that it would be really, really bad if they succeeded. Like cosmically bad. Yeah that bad. T for language Riku/OC