One common theme is self - discovery. Yuu has a unique power, and many fanfics explore how he comes to terms with it and discovers more about himself through his experiences with that power.
Some fanfics focus on Yuu Otosaka's backstory. For example, there could be a fanfic that reveals how he discovered his special ability in a more detailed and emotional way. It might involve some family secrets or early life experiences that influenced his use of the ability, which makes for a very engaging read.
Often, PFPs featuring Sasuke with a determined expression or in a dynamic pose are in demand. Maybe it's because they convey his strength and personality. Also, those with high-quality art and vivid colors get a lot of attention.
Often, manhwa art girl pfps that feature unique hairstyles and colorful outfits attract a lot of attention. Also, those that convey a certain mood or personality tend to be favored.
Often, Lenalee Lee is paired with Kanda Yuu in these fanfictions. She and Kanda Yuu could be involved in projects to help the survivors of the war. Their different personalities, with Kanda Yuu being more brooding and Lenalee being more empathetic, can create interesting dynamics. And there are also fanfictions where he is paired with Bookman, as they might exchange knowledge about the world post - war and how history is being rewritten.
Sure. There was an artist who specialized in creating PFPs with a surreal and dreamy style. One of his PFPs got shared by a major digital art collector on a popular art platform. This led to a flood of requests for his work. He was able to sell many of his PFPs as limited - edition digital art pieces and made a name for himself in the digital art community.