One of the stories I currently write (scifi background) has a strong focus on the relationship between two of the protagonists. They enter the story as kind of mortal enemies, trying to kill each other (an encounter that gets the whole story started in the first place), but then due to circumstances have to band together. They always end up fighting because they are simply too different from each other and don't understand the other's motives and feelings. Now, I always wonder what language style I should use for one of these two characters. The character is a woman, her life was quite hard and at the point where the story starts she's an infamous criminal. She does not have a family of her own nor does she have real friends, is not very educated (but normal or even a bit above average in case of IQ) and the milieu she's usually associated with is the worst one can imagine. She's very short tempered and violent and she constantly provokes everyone around her (especially her counterpart/rival character) and is quite open sexually. She loves making fun of other people, has more of a laid-back attitude and is quite lazy, sometimes kind of a sponger and I'd say quite selfish. I'd like to make her sound like someone who grew up on the streets (and she wants to sound cool/badass when she talks), but I'm not sure how to do that without making it sound like an accent that is reminiscent of a distinct place. As this is Science Fiction, she is not supposed to sound, like... from Boston or from London or something like that. There's no planet earth in this story. So I need to figure out a way to use colloquial speech and slang without making it sound like a distict dialect/accent. And of course it shouldn't get exaggerated to a point it's annoying to read her dialogues. This is quite important as the difference between both rivals also shows up in case of language - the counterpart is a politician who speaks in a very polite, formal and correct way. Can anyone provide some help? Maybe there's a movie or a book you could recommend? Or some words/phrases that you think might fit?