While Holmes is a brilliant detective, he is also a bit eccentric and socially awkward. Watson, a former army doctor, provides a much-needed counterbalance to Holmes's personality. He acts as his confidante, friend, and sometimes even a voice of reason.
In the stories, Watson often serves as the narrator, providing a personal and relatable perspective on Holmes's adventures. He is also a valuable partner in crime-solving, using his common sense and medical knowledge to assist Holmes.
While not always directly involved in investigations, Watson plays a crucial role in Sherlock Holmes's life and success.