Agent 66
An agent similar to Agent 47 from the Hitman series of games and movie. He is the most unusual of the hitmen and carries syringes as  his weapon of choice. He is obsessed with women's shoes. "66" is slang for weird, or is whispered loudly as something/someone weird passes by. 
"That dude is 66", "SIXTY SIXX!!","HAA...", "It's Agent 66!"