South FL (fictional Ft Lauderdale and Vice City, Everglades, the keys)
Set in the 80s or now.
one protagonist. Morality system (a different take on the RDR honor system)
Realistic like RDR2/GTA IV
GTA IV physics (human body reaction to impact of shots, punches etc)
GTA V driving mechanics
Buying businesses, drug dealing, pimping, having to travel to businesses frequently if owner refuses to pay a cut (like gang wars in SA happens and you have to protect it)
Serious story.
story DLC 6 months after game releases
After becoming an empire, have the ability to form a gang / crew (like Saints Row 2, you could decide if your crews style was sporty, urban or mafia esque, imagine this but Even deeper customization, you can name an npc in your gang, somewhat of a label, if they die you can pay a hospital bill to respawn them within a certain amount of in game days or they are lost forever.) also similar to recruiting heist members in GTA V.