Toy Story I have seen, actually (tho' not part 2). But no, Monsters Inc. looked too cloying for my taste. Maybe I was wrong -- but it's still probably too tricky to rent it!
Still, I think there's enough there for me to work with.
Just a couple more questions. 1) Is there someone in charge at the factory/portal who gives the monsters their orders, etc.? This is the most important question, since it greatly affects the framing scenes. And, 2) Do the 2 main characters really figure in these "operations" much, or only if they happen to be assigned? (If not, it'd be easier to invent a new monster in the right scenario.)
How's this sound, as a basic scenario:
Teenage girl has been hearing some odd stories from her friends, about dreams (that don't really seem like dreams, somehow) about monsters popping out of their closets and tickling them. She's overheard a few who had the same "dream" comparing notes. (It sounds like they liked it.) She shrugs it off, and goes to bed.
Meanwhile, back in the Monsters Inc. factory, our heroine's number has come up. A tickler is matched to her, given his marching orders, and sent off.
He enters through her closet, and... the usual thing ensues. 🙂
General hilarity, and coda.
Perhaps a closing hint that this girl was a particularly good source of 'power', and would be worth a few return visits...
Sound at all what you had in mind?
UNO