Katherine McBride is a major character in the video game 'Catherine.' She is Vincent Brooks' longtime girlfriend, known for her intelligence and strong-willed personality. Katherine is practical, caring, and aspires to build a stable future with Vincent, including marriage. Throughout the story, she becomes entangled in a complex love triangle, representing responsibility and maturity in contrast to the game's other main female character. Katherine plays a crucial role in Vincent's emotional and moral struggles, impacting the game's multiple narrative outcomes.