- Captain Edward Smith: The commanding officer of the RMS Titanic, who is portrayed as a seasoned and confident sailor but is ultimately responsible for the ship's collision with the iceberg.
- Charles Lightoller: The second officer of the Titanic, who survives the sinking and later provides eyewitness accounts of the events leading up to it.
- Harold Bride: The wireless operator on duty when the Titanic sinks, who continues transmitting distress signals despite the danger to himself.
- J. Bruce Ismay: The chairman and managing director of the White Star Line, which owns the Titanic, who is criticized for his actions during the sinking and for allegedly prioritizing the survival of first-class passengers.
- Molly Brown: A first-class passenger known for her bravery and leadership during the evacuation, earning her the nickname "the Unsinkable Molly Brown."
- Colonel Archibald Gracie IV: A first-class passenger and a military historian who provides a detailed account of the sinking and its aftermath in his book "The Truth about the Titanic."
- John B. Thayer: A first-class passenger and former U.S. Senator, who serves as the leader of the "millionaire's group" of survivors.
These characters, among others, play important roles in the story, providing perspectives on the events leading up to and during the sinking of the Titanic.