The main characters in Sherlock Holmes were British mathematicians, physicists, logicians, and detectives. The full name was The Complete Sherlock Holmes. Sherlock Holmes was a smart, witty, independent, and decisive figure. His reasoning ability was extremely strong, and he was good at analyzing and solving complex problems. He often used strange methods to solve seemingly impossible mysteries. His thinking process was called "deductive reasoning" or "induction reasoning". He often used "hypothesis" and "elimination" to solve problems. In addition to Holmes, there were many other important characters such as Dr. Watson, Bull Bastian, Sir Percy Holmes, etc. These characters played an important role in the story, providing support and help to Holmes, and also adding a lot of plot and interest to the whole story.