Well, Frank Castle was once a normal family man and a veteran. He served in the military, which gave him all kinds of combat skills. But then, his family got caught in the crossfire of a mob - related shooting in Central Park. Losing his wife, kids, everything in one fell swoop. This shattered his world and led him to take the law into his own hands as the Punisher. He uses his military know - how to hunt down and punish those he deems guilty in the criminal underworld.
Sure, Frank Castle has ended up in prison in the comics. It usually happens as part of the complex storylines and his battles against the criminal underworld.
In Frank Castle's origin story, his military past is crucial. It equipped him with the physical and mental capabilities to wage his war on crime. But the most significant element is the tragic loss of his family. His family was the center of his world. When they were brutally killed by the mob in Central Park, it was like his whole world collapsed. This led to his transformation into the Punisher. He no longer believed in the slow - moving justice system and instead took it upon himself to punish those who wronged him and society at large. His origin story is a blend of his military - trained self and the broken man seeking revenge for his family's death.
The best place to find Frank Castle and Foggy Nelson fanfiction really depends on your personal preference. If you like a more organized and moderated environment, AO3 is probably your best bet. It has a large collection and the tagging system makes it easy to find exactly what you're looking for. However, if you don't mind digging a bit deeper, Fanfiction.net has a vast amount of content too. And don't forget about Reddit. There are subreddits dedicated to fanfiction where you can post requests or search for existing stories about this pairing.
For Peter Parker, you can show his growth in fanfiction by having him face more complex moral dilemmas. Maybe he has to decide whether to side with Frank Castle's extreme methods in a situation where the law fails. This would test his own beliefs about justice. For Frank Castle, you could explore his softer side. Maybe Peter's idealism starts to rub off on him, and he begins to question his one - man - army approach.
In a lot of these fanfictions, the theme of redemption plays a part. Foggy might try to bring out the good in Frank, or Frank might be on a path of self - redemption and Foggy becomes a part of that journey. Also, the idea of justice is prevalent. Frank has his own sense of justice which is very different from Foggy's legal - based view, and how they reconcile or clash over this concept is often explored. And of course, there are stories where they team up to take on a common enemy, which is always exciting.
In a post - apocalyptic fanfiction setting, the world has been taken over by a powerful alien race. Frank Castle and Peter Parker are two of the few remaining heroes. They have to put aside their differences and work together. Peter uses his intelligence and web - slinging abilities to gather information and create distractions, while Frank uses his combat skills and arsenal to take on the aliens head - on. Their partnership is a rocky one at first, but they gradually learn to trust and rely on each other.