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This Article Contains Spoilers - WARNING: This article contains major spoilers. If you do not wish to know vital information on plot / character elements in a story, you may not wish to read beyond this warning: We hold no responsibility for any negative effects these facts may have on your enjoyment of said media should you continue. That is all.

The weak will die. Die, and make way for others.
~ Ryuunosuke Akutagawa.

Ryuunosuke Akutagawa (In Japanese: 芥川 龍之介, Akutagawa Ryūnosuke) is a member of the Port Mafia of the anime and manga Bungo Stray Dogs. He serves as a recurring antagonist slowly becoming redeemed throughout the series. He is a fictionalized version of the Japanese author with the same name.

He is voiced by Kensho Ono, who also voiced Hakuryuu Ren and Shikorae, in the original Japanese anime, and Brian Beacock in the English Dub.


Ryuunosuke has shown to be extremely violent and ruthless when it comes to his work, all the while maintaining a stoic and detached figure. His composure is frequently broken by rage, however. He is quick to lash out whenever something doesn't go his way.

One of his main drives is his determination to get recognition from Dazai, his former mentor turned enemy. His composed nature seems to break whenever Dazai Osamu is brought up. This drive also comes into play whenever he interacts with Atsushi Nakajima, Dazai's new de facto disciple. His rivalry with Atsushi for Dazai's recognition has caused him to have great hatred towards Atsushi. He wishes to beat Atsushi in combat and will go to great lengths just to duel him. 

Ryuunosuke has a Social Darwinist perspective of the world. He believes that the weak deserve to die and yield to the strong. This philosophy heightens his hatred for Atsushi as he considers Atsushi weak, but he is getting recognition as if he were strong.

He also seems to have a general hatred of humanity. This probably stemmed from his history as an orphan. Despite his cold and dark temperament, he has shown to be at least friendly with his sister.


Rashōmon (In Japanese: 羅生門, Rashōmon) is a special ability that manifests as a large shadow-like beast. It is summoned from Akutagawa's coat and can be extended to mid-range. It can consume anything, including space itself. Consumption of space creates an invisible barrier that can block most attacks. He has multiple named transformations for his ability.

  • Rashōmon: Agito (Jaws): Rashoumon takes the shape of a large mouth-like form with large jaws, capable of biting with immense power.
    • Rashōmon: Gokumon Agito (Prison's Jaws): Larger and more powerful version of Agito. 
    • Rashōmon: Jaws of Endless Gates: As Agito but creates several instances.
  • Rashōmon: Murakumo (Gathering/Swarm): Rashōmon extends into a massive claw-like appendage that can perform powerful physical attacks.
  • Rashōmon: Higanzakura (Early Blooming Cherry Blossom):  Rashoumon grabs and lifts a single target into the air and will envelop the target completely over time. He can then cause the grabbed target to be impaled by Rasoumon dozens of times at once as it turns into a spike ball.
  • Rashōmon: Spider Thread: Rashōmon turns into a net reminiscent of a spider web that can capture targets.
  • Rashōmon: Devoured Space: Rashōmon spends time and eats the space in an area, creating a barrier that blocks most attacks. 
  • Rashōmon: Sawarabi (Budding Bracken): Dozens of spikes come out of the ground and impale the target.
  • Rashōmon: Demonic Armor: Rashōmon wraps around Akutagawa and protects him like armor.


  • In real life, Ryunosuke Akutagawa was a Japanese writer during the Tasho Period.
    • His ability is named after the real life novel "Rashōmon" which follows a samurai philosophically questioning morals and self preservation.
    • "Ryunosuke" means "Son of the dragon" and in real life, Akutagawa was born in the year, month, day, and hour of the dragon. This could explain the dragon-like form that Rashoumon takes in Bungou Stray Dogs.