They are popular because fans like to explore the deeper, more complex sides of the relationship between Yuuri and Victor. Problems add drama and realism.
There might be a fanfic named 'The Road to Acceptance' which delves into Yuuri's problems regarding his own worthiness in the relationship with Victor. It's a really emotional read as it portrays Yuuri's insecurities and how he and Victor work through them.
There might be some out there. You could start by looking on popular fanfiction websites like Archive of Our Own. Just search for 'yuuri and wolfram' and then filter through the results to find ones related to pregnancy themes.
Another theme is the pursuit of perfection. Ballet is all about precision and grace, and in 'ballet yuuri fanfic', Yuuri is usually on a journey to achieve that perfection in his performances. It also often includes themes of friendship and support, as the other characters play important roles in Yuuri's ballet life, encouraging him and helping him grow.
Katsuki could become more empathetic. Since One for All is a power that has a lot of history and meaning, he might start to understand others better. For example, he may understand Deku's journey more deeply. He'll still be his bold self, but with a new layer of understanding and compassion added to his personality.
Katsuki remains a living character in the manga. The creators haven't written his death into the storyline. It's possible there's confusion with similar characters or alternate storylines.
In 'female Yuuri Shibuya fanfiction', a frequent theme is the exploration of different relationships. This could include her relationships with family members, friends, or potential love interests. For instance, she may have a closer bond with a female friend that was not as emphasized in the original story. Also, the theme of breaking gender norms often comes up. Yuuri, as a female, might challenge the traditional roles and expectations within the story's setting, which can lead to interesting plot developments.
I'm not sure specifically as I haven't read it in detail. But generally, a light novel often contains elements like unique characters, a fictional world, and an interesting plot. It might involve themes of adventure, friendship, or self - discovery.
How about 'The Love Story of Yuuri and Female Wolfram'? It's simple and straightforward, clearly indicating the main characters and the genre of the fanfiction.
One could be Izuku. He might be there to witness Katsuki's downfall due to bad karma. Izuku could be the one who tries to help Katsuki see the error of his ways, even though Katsuki has been unkind to him in the past. It would add an interesting dynamic to the story.