Holmes is shown to be a man of justice and logic first and foremost that uses his acutely heightened powers of observation and deduction to solve crimes and, more importantly to him perhaps, stave off boredom. He is shown to be fiercely loyal to his friends and, though seemingly not, hyper aware of emotional matters such as John’s interest in Mary.
He also seems to have a penchant for the theatrical, constantly withholding his plans from others, even Watson, in order to astound with a colossal and triumphant arranging of the facts come the seizing of the culprits.
“My mind,” he said, “rebels at stagnation. Give me problems, give me work, give me the most abstruse cryptogram or the most intricate analysis, and I am in my own proper atmosphere”
“How often have I said to you that when you have eliminated the impossible, whatever remains, however improbable, must be the truth?”
“You have done all the work in this business. I get a wife out of it, Jones gets the credit, pray what remains for you?”
“For me,” said Sherlock Holmes, “there still remains the cocaine bottle.”
“But love is an emotional thing, and whatever is emotional is opposed to that true cold reason which I place above all things.”
“Only that I insist upon your dining with us. It will be ready in half an hour. I have oysters and a brace of grouse, with a little choice in white wines. Watson, you have never yet recognized my merits as a housekeeper”