The Master Detective. Would be neat to play as him in a fighting game. Though you rarely see him fight in the original stories, he's obviously no slouch, having bested Moriarty on Reichenbach in fisticuffs.
In a fighting game sense, if this were real, I'd try to make him one big combination of just about EVERY Sherlock interpretation from across the media landscape. So he'd more than be a match for any challenger (having the fighting prowess of Robert Downey Jr.'s Holmes would certainly help).
Made him using Avdol from the weird game "Jojo's Bizarre Adventure", and the head from my Sherlock statue bust I used in that "Lupin's Treasure Room"
stage, which itself used Dhalsim's head as a starting base.
Hope it looks good.
EDIT: Made some slight modifications to the sprite.