Ango Sakaguchi

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

Appearance
He is a tall man with short, dark hair that has the bangs cut so they regularly show his eyebrows, and lightly-colored eyes behind circular framed glasses (though his hair is portrayed as somewhat messier in the anime). His most notable feature is a mole above his lip on the right side of his face.

His normal consisted of a pale brown double-breasted coat which was buttoned to the left, covering a tab collared shirt with a kobicha brown tie. His pants are the same color as his coat, with his shoes being roughly the same color as his tie.

Ability
Discourse on Decadence (堕落論,)

Background
Not much known about his past but it is revealed in the second light novel (Dazai Osamu and the Dark Era) that Ango once worked as Port Mafia's Intelligence Agent, but it was under the Government's orders to spy the mafia's activities. During his time working as an intelligence agent under for the Port Mafia, he also became an agent for Mimic under Mori Ougai's orders.

Dazai Osamu and the Dark Era
In the prologue, he met Dazai and Odasaku in their usual bar, having come from a deal in Tokyo. He shows them the object of the deal, an antique watch. Dazai asks if he has a camera, which he does, and all three take a photo together.

The next day, he was reported missing right after he bid farewell to his friends the night before.

Later, it is revealed that Ango is a spy from the ministry that worked for Port Mafia to spy the mafia's activities. Unfortunately, Mori knew this, using him and the Mimic's (a group of ex-soldiers led by Andre Gide) conflicts with the ministry to get the Ability Business Permit.

Main Story
He was severely injured during a car crash orchestrated by the Guild, partly due to the impact on his side of the car and partly due to the airbags on his seat malfunctioning.

Trivia

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