| Description | Character |
| The protagonist, a Chaplain's Assistant in the Army who time-travels at random | |
| A POW who saves the protagonist's life in a quest for glory, then blames the protagonist for his death | |
| Another POW (and a car thief), he vows to avenge the above character's death by killing the protagonist | |
| A middle-aged soldier and high school teacher whom the Germans execute for stealing a teapot | |
| An American-born playwright and Nazi propagandist, he was the protagonist of Vonnegut's 'Mother Night' | |
| The protagonist's overweight wife who dies of carbon monoxide poisoning | |
| A Harvard history professor and Air Force veteran who shares a hospital room with the protagonist | |
| An insane, delirious Army officer from Cody, Wyoming, who dies of a fever | |
| The prolific, failed science-fiction author who appears in many Vonnegut novels | |
| Another recurring Vonnegut character, he's a veteran who introduces the protagonist to the author's works | |
| The alien race that kidnaps the protagonist, they will accidentally destroy the universe in the future | |
| A model and pornographic actress, the aliens kidnap her, and she bears the protagonist's child | |
| An actual wartime friend of Vonnegut, who visits him while trying to collect memories | |