Ango Sakaguchi

Ango Sakaguchi (坂口 安吾,) is a government worker whose ability is Discourse on Decadence.

Ability
Discourse on Decadence (堕落論,)

Trivia

 * In real life, he is often grouped together along with Osamu Dazai and Sakunosuke Oda as the Buraiha or Decadent School. 
 * And on the series, this is often alluded, because the three used to meet in a certain bar, as seen in Dazai and the Dark Era, and illustrated on the calendar.