I don't have enough information to specifically say who Roman Coleman is in this 'true story'. It could be an ordinary person with a unique experience, or perhaps someone who has made an impact in a particular field but is not widely known outside of the context of this story.
Well, Coleman science fiction might often feature advanced technological concepts. It could have unique alien species with their own cultures. For example, the stories might explore the implications of time travel or faster - than - light travel.
I'm not sure specifically as I haven't read it. It could be about a place called Coleman Hill and the events, characters, and stories that unfold there.
In 'Pulp Fiction', Vince Vega is one of the main characters. He is a hitman. He is played by John Travolta. Vince is involved in various criminal activities throughout the movie, and his character is a key part of the complex and non - linear narrative of 'Pulp Fiction'.