Cobweb is a demon from the Mindscape responsible for trapping Sleepwalker in Rick Sheridan's mind. He's a master of deception and illusion, who used Sleepwalker's being bonded with Rick as a means of invading Earth while preventing Sleepwalker from stopping him. He enjoys invading the minds of vulnerable humans and driving them insane, to the point where they take comfort in his presence even as he destroys them.

Cobweb would be perfect for a plot like this, and it would give the severely underrated Sleepwalker characters some well-earned time in the spotlight, although I don't think it's likely he'll be involved, sadly enough.

You can find more about him here:

http://www.marvunapp.com/Appendix3/cobweb.htm