Excerwise that Brain so you can be Extra Wise

So, you have some characters that are mildly interesting, but they aren't interesting together? Well, here we go, take a character from your current project and have that same character interact with a character from an already established universe, preferably one that you didn't write. This will allow you to see how your character's interact with real fictional characters. It also gives you a way to flush out their particular thought process and methods and over all ability to talk to Harry Potter or what not.