The calm, cold, polite, and deceptive assassin

"My name is William Corbin de L'ombre, Oerth's finest assassin. I work for the Scarlet Brotherhood. Due to my training, I've been described as cold, dispassionate, or aloof, even in the face of danger. However, don’t take that to mean I’m a brooding loner. I interact with everyone in a polite and cordial manner, even if it's just to lower their defenses and create an opportunity for myself."

Creator Note: William is one of my DnD characters, an assassin in the Greyhawk setting from a 3.5e game I've played in for years.