Counselor Deanna Troi (Marina Sirtis) had an accent in the early seasons of Star Trek: The Next Generation, but it becomes less pronounced as the series goes on. As a half-Betazoid and half-human, Troi could sense the emotions of those around her, which made her perfect for the role of counselor aboard the USS Enterprise-d. Not only did Troi help the Enterprise crew work through their problems, she also acted as an advisor to Captain Jean-Luc Picard (Patrick Stewart). Troi's abilities allowed her to tell when potential enemies were lying, which proved useful on numerous occasions.

Originally, Troi was meant to be the outsider character, like Leonard Nimoy's Spock on Star Trek: The Original Series, but her characterization shifted after Marina Sirtis landed the role. She was still half-alien, but she was more sympathetic and emotional than Spock had ever been. Troi intensely experiences the emotions of an alien...