I doubt I will have the motivation to do all these prompts, but this one is cute. Reverse self ship. Part of @fofebruary
Dazai picked up the first volume on a whim one day just because he was bored and he'd randomly found it. He'd expected not to like it all that much, because it's a magical girl series and those are all full of ~light~ and ~hope~ and all the believing in the purity of the world bullshit. But this series had a sense of realness. Still steeped in the classic magical girl themes, but it never shied away from showing the darker parts of the world too and got a bit bloody at some points. What really got him hooked was the purple magic knight, Gillian. She is disillusioned about a lot of the world, struggling to find her place and her reason to be alive, but even those doubts never stop her from trying and fighting for a brighter future and for her team; bonus points, she's adorable and a doofus. He bought every single volume that had been released so far, binge watched the anime, and got every game and so much merch like immediately. This was all back in his mafia days and carries over to the present. He will talk anyone and everyone's ear off about Gillian aka "my goddess!" and openly calls her his wife. Everyone just chalks it up to Dazai being Dazai and that he's a weird otaku but whatever, nothing new.
Not much for romance usually, he honestly can't help falling in love and picturing himself and Gillian together, going on dates, kissing, double suicide, jk actually while Gillian isn't able to outright cure that tendency, he is surprised that the hope of her and her show rubs off on him and knows she would be disapointed hearing him talk about it or offer it
Chuuya hated the series just because Dazai likes it and talks about it nonstop but one day sees a clip of Gillian and gets a crush and he fucking hates it, absolutely denies that he also loves the series now.
Yosano also loves the series and is less open about it but she and Dazai have had discussions about why Gillian is their favorite.
Gin very secretly enjoys the series and often gets all blushy under her mask thinking of Gillian. Tachihara once accidentally found out and she almost slaughtered him when he started to make fun of her.
Higuchi has merch in a shrine in her closet.
Lovecraft does not have any merch but has watched the series after he was introduced to it from seeing Margaret giving Mark a hard time for his figurine he owns. Margaret only does that because she wishes she had the courage to buy more merch but has the whole series tucked secretly away where the rest of the guild can't find it.
Poe has 100% written his own reader insert fiction and uses his ability to experience it.
Also, Ranpo loves the series too and even though he has never really wanted a sibling before finds himself thinking she'd be a good sister. Fukuzawa once pointed out that he seemed attached to this character and he got super embarrassed about it.
Fukuzawa sees Ranpo watching and sees Gillian's struggles and Adopts, nobody but he himself knows this.
Mori thinks she's cute and also adopts and has figurines with changeable clothes, pretty open about it.
And Francis's daughter probably watched and so he bought tons of merch as gifts for her and then later sees it again and gets reminded of his own daughter a little by her favorite character and so mentally adopts, mentions this to no one.
Oda also wishes he could adopt and has spent many hours listening to Dazai rant about her, Ango gets roped in against his will.
Kouyou probably notices Kyouka secretly watching it mostly for the adorable mascot and feels sympathy for Gillian and joins in on the adoption train, sort of tells Kyouka that she wishes she was there to guide the young girl.
Yumeno is given the series to keep them self company in their cell and imagines her as a big sister that would take care of him and not leave him alone, has no one to tell.
Dialogue: "Shall I enlighten you, young Atsushi, on true perfection?."
Erza hears about this book series not long after escaping the tower of heaven and joining the guild. She finds strength in Gillian's refusal to stop fighting and her dedication to her friends. She gets a crush, but the series stays in the back of her head until years later she finds it again and rereads and this time falls in love with the purple knight. She has a whole bunch of merch but refuses to tell anyone about her love out of embarrassment.
She also secretly has two requips where one is a cosplay of Gillian's magical outfit and the other is a piece of armor that she thinks looks like what her magical outfit would be. She never uses them to fight, and requips into them for fun sometimes when she's home alone, cosplays and imagines she's one of the magical knights too.
Dialogue: "What'cha got there, Erza?"
Byleth saw this play while she was traveling around as a mercenary and was instantly captivated by the story of Gillian the purple knight. Her design was really what drew her in, but as they continued on their way she kept thinking about her and thought about how amazing she is. The next town they reached that had a production of the play, she insisted on watching again, and so it continues everytime they find a troupe putting it on. They come across a merchant one day who has a wall scroll of Gillian, and even though she knows it's silly and that with all her traveling there's not even a wall for her to hang it on, she buys it and carries it around. She's not sure what she feels, since love is kind of out of her reach at this point, but she knows she admires Gillian.
Her dad suspects she has a crush on Gillian and thinks it's cute. She won't go out of her way to talk about the play or Gillian, but she will talk about it if asked. Her students know that if they want to get on their teachers good side and try to get a grade bump that they can give her anything related to the series.
It's only after she starts being able to really feel her emotions that she realizes she's in love with Gillian.
Dialogue: "Isn't she cute?"