You know I couldn't make lessons out of all those Gravity Falls characters without making a lesson on "how to draw Robbie", step by step. Every main character has to have an enemy and for Dipper it's Robbie. Being archenemies with Robbie is pretty difficult because he is what you call an antagonizer. I don't know for sure, but I think Wendy and Robbie broke up. The last few episodes I watched with my litter sister, Wendy wasn't dating Robbie. Anyways, everyone knows that Wendy is fifteen, but how many of you know how old Robbie is? I was thinking he is seventeen, but now I'm starting to think he might be older. Anyways, have fun drawing Robbie folks, I know you will because the animated series is pretty good. Peace people and enjoy!