Gmork, the bad guy in 'The NeverEnding Story', is extremely evil for several reasons. First, he is allied with The Nothing, which is a powerful and all - consuming force of destruction. His purpose is to further the spread of The Nothing by stopping Atreyu from finding a cure for the Empress. Second, he shows no mercy or kindness. He uses his strength and cunning to attack and deceive. He is a symbol of the darkest aspects of the threat to Fantasia, representing the idea that there are forces that simply want to see beauty and magic erased without any regard for the lives and the world that will be lost.
As far as I know, there may not be a 'Never Ending Story 3' officially released. But the film industry is always evolving, and new projects can come up unexpectedly.