I'm talking about neutral people, who can be villains and heroes. For example, they'll help you carry out a robbery but wouldn't mind helping the person being robbed by telling you they've got it out for you, and telling them that you've got it out for them. I hope this makes sense, and if it doesn't here's a scenario:
Bob sells information. He will sell Jeff information from Tom. But he decides to get profit from Jeff and turn this around on to Tom.
What I'm saying is, they can't be trusted and are egotistical masterminds.