everyone always seems to imagine me as a biker.... but believe it or not i'd rather be a professional robber.
in the start of the game, i would be in debt to the mafia which means i do some jobs for them so that they don't whack me. (cliche, i know.)
when my debt is cleared, i'd start out with my crew by doing a small, low-risk heist with low-pay. then i'd work my way up the ladder and do more dangerous heists, with higher rewards.
once i climb the ladder and start doing more dangerous heists, i decide with my crew to rob a big business that belongs to the mafia that forced me to do their dirty work (like Caligula's casino in SA) as a big fu*k you to the mafia that used me. so then the mafia boss becomes the main antagonist of the game.
i don't know i'm not a damn writer..... it's certainly a better robber story than GTA V where you are a bitch for the FIB. at least in my story you get to have revenge on the people who made you their bitch.