Well, it depends on the nature of the'sever ending story'. If it's a fantasy story, the bad guys could be dark wizards or evil demons who are causing chaos and destruction in the sever (I assume you mean'severe' here). Maybe they are trying to take over the world or harm the innocent protagonists. But again, more details about the story are needed to be certain.
Well, in the 'The NeverEnding Story', it's Gmork who can be regarded as the bad guy. Gmork is not just an ordinary villain. He is a part of a greater evil, which is the Nothing that is slowly devouring Fantasia. He is sent on a mission to stop Atreyu from reaching the Southern Oracle. He is quite a formidable foe, with his sly and cunning nature. He uses his intelligence and physical strength to try and stop Atreyu from achieving his goal, which is to find a way to save the Empress and in turn, save Fantasia from the clutches of the Nothing.
Well, there's Gmork for sure. He's like this dark agent of The Nothing. The Nothing is this really bad force that wants to erase Fantasia, and Gmork is out there doing its bidding. He's not just a physical threat but also represents the encroaching doom that Fantasia faces.
As mentioned before, Gmork has a wolf - like appearance which makes him look menacing. He is also very loyal to The Nothing, which is a negative characteristic as The Nothing is all about destruction.
From the search results provided, he did not find any specific information about " plundering the heavens from the bad people." Therefore, I don't know anything about 'plundering the heavens from the bad people.'
I'm not entirely sure which specific 'girl' you mean. There are female characters in 'The NeverEnding Story'. It could be the one that Atreyu meets during his adventures. Maybe she's a minor character that has some significance to the overall plot, like giving Atreyu some advice or helping him in a small way.