NOTE: I’m probably going to Scratch this idea (pun intended) and make a few changes to make it faster and more flexible.
Drag the Pen Text sprite into your backpack if you want to use it. That's all there is to it. :) I'll be using a pen text engine for Vanish 2, but it can be a pain to work with variables if there is one for each character, so I just adapted my previous one to use lists instead.