Possessive Author: Well known for being over protective of his works. This is probably because of how Gargoyles was treated earlier by Disney and now that he has more creative control over his works he is anxious to avoid further Disneyfications.
The Woobie: The amount of times he gets screwed over in the middle of production (all of which seem to have Disney playing a role) is just depressing. And combined with how Greg is still enthusiastic that he can still get ahead just makes him a complete woobie.
You also have to respect him for having no hard feelings about being screwed over, he's disappointed certainly but he knew the risks when he took the job. He also tells his fanbase that he appreciates their support, but what's done is done, there's always the next cartoon.