While there are several specific characters involved in the events that drive the protagonist, Parker, to seek revenge, it's not a single individual but rather the organized criminal underworld that represents the core opposition.
Here's a breakdown of why:
* No singular villain: The book doesn't focus on a single, clear-cut villain. Instead, it highlights the corrupting influence of organized crime, exemplified by characters like the mob boss, "The Accountant", and the various thugs who carry out his orders.
* Parker's motivations: Parker's pursuit of revenge stems from the betrayal and attempted murder he suffers at the hands of these mobsters. He targets them collectively, not just one individual.
* Thematic exploration: The story explores the inherent dangers of organized crime and the impact it has on individuals caught in its web.
Therefore, while specific mobsters like "The Accountant" and others contribute to Parker's plight, the antagonist in *Point Blank* is ultimately the organized criminal underworld, represented by the various individuals and structures that seek to control and exploit.