Femt

Femt (フェムト, Femuto) the 'King of Depravity' (墜落王, Tsuiraku-ō) is one of the Thirteen Kings and self-proclaimed ruler of Jerusalem's Lot.

Appearance
A tall, thin man with long limbs & blonde hair who wears a steel mask to hide his upper face along with a black suit & white gloves. In the anime, he wears what appears to be a white lab coat.

Personality
Sadistic and clearly insane, Femt lives for excitement & can't stand anything 'normal'. In a city full of people willing to start their own millenium reich, even Zapp acknowledges that Femt is the worst.