Bio

John is extremely brave, resourceful and practical. He is extremely loyal to Sherlock, and will usually, but not always, do what Sherlock asks him to, and cares a great deal about his well-being. Sherlock likewise cares about John. He is also very selfless and modest, as he puts himself at colossal personal risks to help Sherlock Holmes and is rather sceptical about his companion's ideals. He is very sarcastic and has an erratic sense of humour.

John deals with lack of stimulation little better than Sherlock does, the difference being that when Sherlock is bored he is very vocal in his frustration; when John feels that "nothing ever happens", he withdraws into a shell and shows strong tendencies towards depression (possibly exacerbated by his post-traumatic issues). He is adept at reading people through facial expressions, whilst Sherlock relies on his surroundings, on clothing and personality displays to read people.

Due to his military career, John is incredibly proficient with firearms, far more so than Sherlock or Lestrade, proving to be able to judge the distance and split-second timing of a shot across a large area with two windows in the way, and fatally wound his target while missing Sherlock, who was standing very close to the target.

His military career has also given John skill in unarmed combat that rivals.[citation needed] His skill in unarmed combat is also displayed where he sprains someone's arm in a single move and, as he is a medical expert, he is perfectly aware that he sprained it and how bad it should be.

According to his CV, John is "able to recognize and give immediate and appropriate treatment to a wide range" of illnesses and dysfunctions, including "myocardial infarction, acute coronary syndrome, pulmonary embolus and Sickle Cell Crisis, deep vein thrombosis, acute asthma attack, severe exacerbation of chronic obstructive pulmonary disease, diabetic keto-acidosis, community and hospital acquired pneumonia, seizures, poisoning/overdose, acute abdomen and post-operative oliguria hypotension".