Casting 1.3 - The great game

This episode doesn't lack of excellent characters ! I made a subjective choice with the list below :

Casting 1.1 A study in pink

In this introductive episode, all main characters are present (aside Mary Morstan and Bill Wiggins, season 3). Below are the characters appearing only (or mainly) in this episode.

Sherlock Holmes : such an attractive smackhead...

Sherlock is uncommon in many a way: 

He is able to focus his superior mind on certain topics, all related to crimes, and display genial deductions; at the same time, he is completely ignorant in other fields, because he doesn't care and doesn't want to waste intellectual resources on it. That enough makes him more than an eccentric, a "freak". 

John Watson : simply irresistible !

John Watson, Holmes's rock

There is a enigma about John : what does he fear ?

We know little about John's past : he made his medical studies in London, was a military doctor -a good one, received a bullet in the left shoulder, and came back to London. He's got a sister, with whom he doesn't get along very well.

Mycroft Holmes

Mark Gatiss reserved a choice character for himself, and he did well to do so! His Mycroft is puzzling, subtle, cold and annoying, but sometimes lovable when he accepts to show that he cares for his "little brother".

Casting 1.2 - the blind banker