It would be understandable to think that Sherlock primarily focused on solving crimes. But the show also paid a lot of attention to the development of the main characters. Sherlock Holmes became more emotional throughout the show, even though he still kept his intelligence and brilliant deduction skills.
Some fans were disappointed the show didn’t put more emphasis on romance. The truth is Sherlock Holmes in the books never was a romantic person. That didn’t stop the audience from shipping Sherlock with his best friend John Watson or the mysterious Irene Adler. In both of these cases, Sherlock had a lot in common with John and Irene.
John could have very well led a perfectly normal life after he came back to London. Instead, he chose to jump straight into Sherlock’s eccentric life.
John hated his mundane existence and he wanted to do something different but didn’t know what. Sherlock provided him with a functioning alternative. Solving crimes together was often dangerous but both Sherlock and John thrive in danger and the excitement and rush of adrenaline it provides them with.
When Sherlock believed Irene Adler was dead, he reacted in a way that spoke a lot about his real feelings. He didn’t eat and spent a lot of time playing sad tunes on his violin.
Sherlock isn’t the most outspoken of people when it comes to his emotions, even though he has feelings, he rarely shows them. But his behavior proved that he had a real affection for the presumably dead Irene Adler.
Sherlock could have easily chosen a different path for him. With his incredible intelligence and other skills, he could have become the greatest criminal of all time. Yet he chose to help people, even when he sometimes mocks them for their stupidity. John also prefers to aid others, as his profession as a doctor is all about helping those in trouble.
Irene Adler, on the other hand, has no trouble committing a crime, as long as she gets what she wants. Ultimately, she and Sherlock live on opposite sides.