The antagonist could be a super - villain who has a personal vendetta against the hero. He might have used his influence to make the hero's life a living hell and made everyone think the hero was worthless, like garbage. The hero's revenge is all about taking down this super - villain and restoring his own honor and the safety of the world that the villain has been threatening.
Well, it could be about a hero who was once discarded like garbage by society. Maybe he was wrongly accused or betrayed. His revenge might involve taking on those who wronged him, using his new - found powers or skills. He could start from the bottom, among the 'garbage' of society, and rise to bring justice to himself and others who were also mistreated.
One possible theme could be redemption. The hero, who might be associated with garbage in some way, could be seeking redemption through his revenge journey. Another theme could be social inequality if the garbage represents the lower class or the outcasts that the hero belongs to and is fighting against the privileged through revenge.
The hero, who is initially regarded as 'garbage' by society, might be someone with a hidden power or a great potential. He could have been wronged in the past, perhaps betrayed by his friends or discriminated against because of his humble origins. The revenge part would start when he decides to rise above his circumstances. He starts training, learning new skills, and using his wits to outsmart those who once looked down on him. Eventually, he would confront his enemies one by one, showing them how wrong they were to underestimate him.
A 'garbage hero' might be morally ambiguous. They could have vices like excessive drinking, lying, or being selfish. For example, they might steal or cheat to get what they want.
There are countless light novels, and it's difficult to point out one named 'garbage hero a revenge story' without more context. But if you're into revenge - based light novels, 'Overlord' is a great choice. In it, the main character is in a rather unique position where he has to assert his power and take revenge on those who might oppose him in the new world he finds himself in. It doesn't have the exact 'garbage hero' concept but has related themes of a powerful entity seeking retribution.
An organization that opposes the hero's unorthodox methods could serve as the antagonist. They might believe in a more traditional way of heroism and see the hero as a threat to their established order. They could try to stop the hero from using their unique abilities or ways of doing things.
Most likely, the 'terror' itself is the antagonist. It's what the hero has to fight against.
It could be a modern - day villain who wants to use the power of the ancient heroes for his own evil purposes. He might be jealous of Percy's connection to the ancient heroes and try to stop him at every turn.
The 'garbage hero light novel' could have a very diverse plot. It might be about a hero who is initially underestimated or considered worthless like 'garbage' by society. He or she then embarks on a journey to prove their worth. Maybe they discover some hidden power within themselves that is related to the 'garbage' concept, like being able to recycle negative energy into positive power. Or it could be set in a post - apocalyptic world where resources are scarce and the hero has to scavenge among the 'garbage' to survive and save others.
I haven't actually come across a 'garbage hero a revenge story novel' in mainstream literature. It might be a title created for a very specific, perhaps local or independent writing project. There are countless novels out there, and this one doesn't seem to be among the commonly known ones. So, I can't really give a proper introduction as of now.