Dr. Watson

Dr. John H. Watson is the primary narrator of the Sherlock Holmes stories.  A veteran of the Second Afghan War, he was discharged from military service due to injuries and poor health.  On his return to London, he found lodgings with an eccentric young man named Sherlock Holmes.  Initially perplexed by his new companion's strange habits and lack of common knowledge/popular taste, he later found great respect for his friend's abilities as a detective.  The good doctor soon became an invaluable asset to Holmes, acting as his assistant on cases, as well as becoming his official chronicler/biographer (or, to use Holmes's phrase, "my Boswell").