MC:
You have the creative freedom to do whatever you want.
Plot:
First I wanted the fanfic to take place in the 3D and HD universe of GTA, but I realized it was boring, so I decided to add the world of The Boys.
Eventually the protagonist will meet Billy Butcher as a world of murderous heroes is bad for business.
There are so many movies that can be included in this fanfic like Lord of War, The Godfather, The Blacklist, etc.
Ultimately, I would like the MC to be a mafia crime boss, an arms dealer, on top of that a politician, businessman, and philanthropist, in other words the Kingpin.
Ending:
Look, I wanted the ending to be a little different, that the protagonist faked his own death after a final fight with Homelander and everyone thought he died only to discover a hidden briefcase with a voice message saying otherwise and also money for everyone to start their lives over.
Then the pov would jump to another scene of a waiter on a tropical island calling the protagonist by another name like the Senor Hitler memes.
Did I cook or just shot myself?
Extra:
I have nothing to comment on, only if someone wanted to try to write this I could think of more details.