I do find it interesting how people genuinely believe Dazai's going to be the one to defeat Fyodor.
Let's just look at who's defeated major villian's in the series so far.
Fitzgerald was defeated by Atsushi and Akutugawa. Goncharov was defeated by Atsushi and Akutugawa.
Akutagawa kicked Hawthorns ass and than Lucy had him imprisoned in Anne's Room.
If it weren't for time travel shenanigans Atsushi would've killed Fukuchi. Atsushi killed Shibusawa in Dead Apple. Atsushi defeated Gabriel in 55 minutes.
And so on and so fourth.
Atsushi is also the one Fyodor's been trying to get his hands on from the beginning. Fyodor literally just left Dazai behind in France to go to where Atsushi is currently.
And it seems like the dude from the epilogue we saw fighting Atsushi (and than Akutugawa) is what's being summoned.
Not saying Dazai's never contributed to a fight but when it comes to taking villian's down, it's not him doing it.
And even if your talking about Fyodor's ability, there's no guarantee it would even work on Dazai to begin with.
And Atsushi has the ability to seperate a person's ability from themselves. Which would be a neat callback to Dead Apple but I doubt it'll be that simple.
I know it's apparently very easy to forget but Atsushi is the main character. He's the cat and Fyodor is the rat like... Come on.
Atsushi has a poor habit of accidentally getting pictures and videos of him uploaded online. It started as a coincidence the first couple times but now it’s a running joke, made more ironic by how Atsushi is actually incredibly camera shy.
Over the course of time Atsushi has gotten 3 videos of him fighting against an enemy solo, a recording of him singing his favorite song(said song had its own 5 minutes of fame because of that recording), he somehow managed to be the one to go on a “mission” that was actually a research project to see how people act when they are alone where a bunch of bodyguards are hired to stay alone on an empty stage for an allotted amount of time, too many random photographs of him to count, and more.
Some people are even starting to accuse Fukuzawa of having Atsushi do this intentionally to attract more clients by showing off one of his cute employees, which Atsushi would speak out against if the cute part didn’t trip him up so much. All in all Atsushi happens to get a lot of inconvenient attention and the agency has learned to live with their little trouble magnet.
atsushi's favorite food has always been chazuke but it's been even more special since he was starving and two men took him off the street and fed him and let him eat bowl after bowl without stopping him