>>150785137
1. She's coming off the heels of one of the most popular incest ships (Lucycoln), two of the most popular characters in the show.
2. I'd argue she has the most striking and noticeable designs of the sin kids, her black jacket highlighted by golden edges and topped off the pale skin and white hair makes her stand out.
3. Her personality commonly comes in three fan accepted varieties: Daddy's girl, Sadodere with a heart of gold, and edgelord who smokes and hates the world and has daddy issues. These wide ranges of the interpretation of her character means that many can make what they want of her, and appeal to a wider audience.