The amount of unique dialogue each class has in Borderlands: The Pre-Sequel depends on which specific class is chosen. Most classes—such as Athena the Gladiator, Wilhelm the Enforcer, Nisha the Lawbringer and Claptrap the Fragtrap—have unique dialogue options that are specific to them. The unique dialogue for each class focuses on their individual personalities and traits, as well as their story arc within the game. For example, Athena, a former glory-seeking warrior from the moon Elpis, is devoted to learning from Tassiter's past but also holding him accountable for his actions. At the same time, Wilhelm is a powerful military android from Hyperion whose loyalty to his employer, Jack, is unquestioned.
Each of the classes also has access to some special missions that depend on their individual abilities and story arcs, adding even more unique experiences to each class. For example, Athena gains access to some special 'Echo™ Logs' when completing certain missions alongside Tassiter, while Wilhelm receives unique dialogue when protecting Hyperion's interests during the course of the game. There are also a handful of recurring side missions that all classes take part in, such as collecting loot and defeating enemies.
Ultimately, the amount of unique dialogue available to each class in Borderlands: The Pre-Sequel depends on the class that is chosen and how far the player has progressed in the game.