Actually, various ordinary thieves are lockpick merchants. The King of Thieves, conversely, has a perchant for fighting, and supposedly holds a most Magical Key. (But maybe he has something else... something more important.) He also might or might not have an underling called the Prince of Thieves, who furthermore may or may not just be a palette-swap. But more on him later!
EDIT: Oh! You were thinking of Blind the Thief. That sounds a tad fitting. Maybe he will be vaguely reminiscent of that boss.
