Fyosig

"If you speak in terms of "levels", it's the Hunting Dogs who exist below him. And not just the Hunting Dogs. All of creation. Even you or I...do not compare to Sigma."

- Fyodor to Dazai on Sigma's drive and will in Chapter 74 Fyosig is the slash ship between Fyodor Dostoyevsky and Sigma from the Bungou Stray Dogs fandom.

Canon
Fyodor and Sigma are both members of the Decay of Angels. Sigma was written into existence through The Book, leading to his enslavement in his first years of existence; this led Fyodor to recruit Sigma as member of the Decay of Angels, and as payment, gave Sigma something to hold onto, the Sky Casino.

Sigma dislikes Fyodor, working to defeat him and detesting how Fyodor was another person who simply used Sigma. Sigma is determined to beat Fyodor to secure a home to belong to; however, he views Fyodor as an extremely intelligent and formidable opponent, panicking and fidgeting during the prison break game after realizing he's paired with Dazai to beat him.

Fyodor views Sigma as the strongest of their board and is the only person who understands Sigma on a deeper level, which allows him to exploit Sigma's attachment to the Casino as a step to the Decay's plan. Fyodor recognizes Sigma's great determination and desperateness, describing him as the "ultimate outsider." Fyodor has no sense of care or sentiment towards Sigma however, ordering Hawthorne to kill Sigma and attempting to kill him multiple times.

Sky Casino Arc
Throughout Chapter 74, Fyodor describes Sigma's drive and will to Dazai in Meursault, dubbing Sigma to have "melodies of sadness playing in his veins." and seeing through Sigma's loss of identity, showing his deeper understanding of Sigma's identity and desperateness. Fyodor calls Sigma the strongest and agrees with Dazai that Sigma is not a terrorist at heart. Fyodor emphasizes how Sigma, the common man, is the scariest when desperate. Fyodor praises Sigma to be above even Dazai and Fyodor himself, and that all of creation is below him. Fyodor's words on Sigma all prove correct, as Sigma manages to overpower the Hunting Dogs out of sheer desperation.

In Chapter 75, Fyodor tells Dazai about Sigma's ideology of how the casino is the same as Sigma himself, explaining his solitude drove him to his state of desperate fighting. Fyodor then reveals that Sigma was created from the Book, and Dazai shows shock at Fyodor's explanation. Sigma's past with Fyodor is then revealed; for three days as Sigma wandered the desert after being born into existence, he was captured and enslaved by a criminal organization, used for multiple crimes. Sigma had managed to escape enslavement, unable to trust a soul before Fyodor approached him with, in Sigma's eyes, a motive to use him. Fyodor approached Sigma with the question, "Would you like a home?", leading to Sigma able to finally call a place his home, the Sky Casino. After joining the Decay of Angels, he named himself Sigma.

In Chapter 76, Hawthorne, from Fyodor's orders, appears after Atsushi saves Sigma from his fall. The two assume Hawthorne is here to eliminate Atsushi, however, Hawthorne instead attacks Sigma, leading to the latter's near death ordered by Fyodor himself.

Kamui Revelation Arc
In Chapter 78, after Sigma is saved by Nikolai, he shows confusion at why Nikolai defected from Fyodor's plans, leading to Nikolai explaining his plan to kill Fyodor in an effort to free himself from human emotions. Then, Nikolai explains he saved Sigma to use his ability and asks him to use his ability to find out Fyodor's abilities. Off-screen, Nikolai and Sigma devise a plan to break Fyodor and Dazai out of Meursault.

Vampire Infection Outbreak Arc
In Chapter 97, Sigma stays back and watches as Nikolai happily reunites with Fyodor. Sigma glumly thinks about how he's the only sane person in the room. When Fyodor and Dazai start injecting themselves with the lethal substance, Sigma watches in horror and thinks to himself, "These people are injecting themselves with poison...and laughing all the way." Fyodor and Dazai start blushing and imagining each other's deaths, causing Sigma's horror of the fact that they're gleefully imagining each other drowning. Once Sigma brings out the tools, Fyodor picks the key card, leading to Sigma contemplating Fyodor's genius. Sigma thinks to himself how Fyodor "behaves in cryptic and almost ghostly ways," and that his "cold logic is more rational than anyone else's." Sigma then looks back at Hawthorne's attack, thinking "Such was the case before as well..."

In Chapter 98, once Sigma is picked as Dazai's tool, his determination and fervor to beat Fyodor manifests as he continually scolds Dazai for treating the situation lightly. Sigma angrily asks Dazai how they'll beat Fyodor, throwing a punch at Dazai saying Fyodor is approaching the exit as they speak. As Dazai continues dancing with Sigma, the latter walks off and angrily tells Dazai, "You don't stand a chance against Dostoyevsky! That much is obvious to me!" and then, with passion and anger, thinks about how he has a good reason to win this game. Sigma thinks back on when Nikolai saved Sigma from his fall, asking why Nikolai wants Sigma's assistance in killing Fyodor. Nikolai then states that once Fyodor finds out the hit on Sigma failed, he'll pursue him; Nikolai says that if Sigma doesn't kill Fyodor, he'll never obtain a home to be safe in. This motivates Sigma greatly; he thinks about how everyone in the world has had a place they were born in except him. Then, Sigma angrily thinks back on everyone who's used him, determinedly stating he'll beat Fyodor then secure a home to live in, not letting anyone use him again. In Chapter 101, Sigma voices his concern of having to fight against both Fyodor and Chuuya combined. Sigma shows incredulity to Dazai’s method of communication with the outside world; this leads Dazai to egg on Sigma by saying if he guesses the answer correctly then he’s above Fyodor. Sigma then imagines Fyodor slumped on the floor (in the anime he steps in him), giving him a comedic motivation to guess the answer correctly. His determination makes Dazai muse on how Sigma is similar to Atsushi. Sigma then realizes Dazai is messing with him and angrily explains they have to escape before Fyodor.

Quotes
"That's why, to protect the casino...he'll burn even the Hunting Dogs with a hellish drive. After all... You won't find a thing scarier in the world...than the common man when he's desperate."

- Fyodor to Dazai on Sigma's drive and will in Chapter 74

Fanon
Fyosig is a relatively popular ship with around 460 works on AO3. It’s mainly rivaled by Fyolai and Sigzai.

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