Main Characters in GTA 6
"Herwin Bronthson (1969-determinant) is a central character and one of the seven playable characters who later became the main antagonist in Grand Theft Auto VI. He is the United States Secretary Of Defense and the benefactor of the National Office Of Security Enforcement."
GTA 6 Protagonist
"A voice actor by the name of ‘Dave Jackson’ has claimed he’s playing the role of ‘Captain McClane’ in the next GTA title (presumably GTA 6 VI). So, Captain McClane, huh? Interesting."
Setting of GTA 6
"That post suggests that GTA 6 is codenamed Project Americas and will be set in Vice city and a new city based on Rio de Janeiro. It’s rumoured to be set between 1970 and 1980 and the main character is mixed up with the drug trade. The game may feature drug empire mechanics inspired by Vice City."