OK, so I have introduced our hero and our heroine. But what about a villain? That is going to be more complicated.
Villain is a hard term to describe. For our purposes, you must follow the old joke:
A small bird fell out of a nest. Lying on the ground wondering how he would ever get back up into the tree, a horse came along and pooped on top of the little bird. Indignant, the bird began to tweet for help. Soon a hawk came along, cleaned the poop of the little bird and then ate him. The moral of the story (and what you need to keep in mind here):
Not everyone who dumps on you means to hurt you, and not everyone who helps you out is working for your benefit!
Cryptic, but appropriate!