It's likely you're referring to "The Black Swan" by Nassim Nicholas Taleb, which explores the impact of highly improbable and unpredictable events. However, this book doesn't have traditional main characters in the sense of fictional characters.
Instead, it focuses on exploring concepts and ideas related to:
* Black Swan events: Unexpected, impactful events that are impossible to predict.
* Randomness and uncertainty: The inherent unpredictability of life and the limitations of prediction.
* Fragility and antifragility: How systems and individuals can either be made more vulnerable or more resilient by unpredictable events.
Taleb uses anecdotes and historical examples to illustrate these concepts, but the book's focus isn't on specific characters but rather on these broader themes.