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.
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.
Perhaps there is a conflict in their world where they have to team up to protect their kingdom. Yuuri, with his unique skills, and Female Wolfram, with her own strengths, form a strong alliance. As they face challenges, they grow closer and their relationship deepens. For example, they might have to fight off an invading army. Yuuri could use his strategic thinking and Female Wolfram her combat abilities. In the heat of battle, they realize how much they rely on each other, which then leads to a romantic connection.
Love and commitment are common themes. Their relationship is at the center, showing how they stay devoted to each other. Another theme is the adjustment to married life. Yuuri, coming from a different background, and Wolfram, with his own set of expectations, have to find a common ground.
I'm not sure of the exact title, but there is a fanfiction that shows their married life during festivals in their kingdom. It describes how they celebrate together, interact with the people, and how their relationship has grown and deepened since getting married.
Love and support is also a big theme. Some fics take their relationship to a romantic level, showing how they love and support each other through thick and thin. They might comfort each other after a tough battle or just be there for each other during a bad day.
One common theme is the 'opposites attract' idea. Aizawa is often portrayed as more serious and stoic, while Ms Joke is humorous and outgoing. Fanfics might explore how these different personalities interact and complement each other.
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.
Well, a good listener in a social story is like a silent supporter. They listen with empathy. That means they try to understand the feelings behind the words. For instance, if a character in the story is sad while talking, a good listener will pick up on that and respond in a kind way, maybe by offering comfort or just by being there for them.