Canon That Is Most Likely Relevant

If you want to play with me - you have to send Mundane a message.

This version of Sherlock:
~does have Asperger's
~was terribly bullied in boarding school
~can play almost anything on the violin
~had a sister that died in the London Bombings
~was absent 18 months post-Reichenbach
~shut down a facility in France that used terrible methods on autistic kids
~has tortured Moriarty's associates for information relating to other associates/other crimes
~broke wrist while escaping said associates, who suffered a rather miserable fate afterwards
~maybe disorderly about his flat, but obsessed with the state of his slides/microscopic files
~depending on where we are in canon, may still suffer from addiction

Other things you should probably ask mundane.