I made up random verses that fictional characters would use if they got into a rap battle. Here's an example of one for Hatsune Miku:
Oh look, someone trying to steal my fame.
You know I'm famous, right? You're just super lame.
I'm the #1 Vocaloid, you were just released.
I'm usually beauty, but today, I'm a beast.
Yep. I was that bored.