>>102088292Ghost is a vigilante, except that he doesn't fight guys with superpowers. He fights corporations, conspiracies and corruption.
Ghost (we never learn his real name) has an axe to grind with modern corporate greed and, in particular, the military industrial complex. He's like that crazy conspiracy theorist who thinks that GE is building spy satellites to control you through the fillings in your teeth. Given the world he lives in, however, that's not actually crazy.
In the Marvel universe, you've got the military industrial complex building giant robots to kill their own citizens for being genetically different, experimenting on people to try to make super soldiers, and actively engaging in corporate espionage to steal technologies from one company to give them to other, less scrupulous ones. The Red Skull managed to get himself into a position of power in the United States government using the ridiculously obvious name Dell Rusk. Shapeshifting aliens have stolen and replaced major players in every field from government to corporate to superpowered heroes and villains. Tony Stark built a satellite that literally made everyone on Earth forget he was Iron Man. Ghost isn't crazy for believing that the powerful people, and in particular the corporations, are out to get him and the rest of humanity; he's arguably one of the few sane people in the Marvel universe when it comes to his beliefs.
If you really take a step back and look at his actions, he's often more of a hero than the heroes he fights.