A Vulcan literary theorist whose Dictates of Poetics lays down strict rules of narrative structure, cited by Tuvok when he and Tom Paris argue over finishing a holonovel.
T'Hain was a Vulcan writer on the theory of literature. The Dictates of Poetics holds that a character's actions must flow inexorably from established traits, a logical approach to storytelling that leaves little room for surprise.
The work is cited in the Voyager episode Worst Case Scenario. Tuvok's abandoned security training programme, which imagines a Maquis mutiny aboard the ship, has become the crew's favourite entertainment, and Captain Janeway asks him to complete it with Tom Paris. The two immediately disagree: Paris wants twists and passion, while Tuvok insists on following T'Hain's rules. Their quarrel is cut short when a trap hidden in the programme by Seska turns it into a real threat.
T'Hain is never seen and the author's era is not stated.