One common theme is the growth of their relationship. It often shows how their feelings develop over time, from being just comrades to something more romantic.
One common theme is the growth of their relationship. Since in the original story their relationship has potential for development, fanfics often explore how they get closer over time. For example, through shared adventures or moments of mutual understanding.
Growth is also a theme. Noelle crying might be a turning point for her character. It could be the moment she decides to be more open about her feelings, both to Asta and to herself. This can lead to her personal growth in the fanfic.
Perhaps in the fanfic, there is a misunderstanding. Asta might accidentally say something that makes Noelle think he doesn't care about her. This could lead to Noelle crying, and Asta then has to figure out what he said wrong and make it up to her. It could be a story about miscommunication and making amends.
One possible plot could be that they are in a spooky dungeon during a mission. Noelle is scared of the dark and the unknown creatures lurking. Asta, being his brave self, tries to comfort her and protect her. As they face different challenges, their relationship deepens.
One possible plot could be that while on a mission, Asta and Noelle encounter a powerful and strange magic that makes them both sick. As they struggle with their illness, they have to rely on each other more than ever. Asta's unwavering determination might inspire Noelle to be stronger even in her weakened state, and their relationship could deepen as they face this difficult situation together.
Romance is also a common theme. Since they are two main characters in the series, many fanfics explore the budding relationship between Asta and Noelle. This can range from a slow - burn romance where they gradually realize their feelings for each other, to more fast - paced stories where their love is more immediate. It adds an interesting dynamic to the stories.
Some common themes in this kind of fanfiction include the miscommunication trope. Jealousy often arises because of misunderstandings. For instance, Asta might do something innocent that Noelle misinterprets as him being more interested in Rebecca. And then there's the theme of personal growth. Through dealing with jealousy, the characters can grow as individuals. They might learn to be more confident or better at expressing their feelings.
In the fanfic, since Noelle is sick, it could be a chance for their relationship to develop further. Asta, being the energetic and kind - hearted guy he is, would probably do some silly things to cheer her up. And Noelle, in her weakened state, might let her guard down more around Asta, leading to some really sweet and tender moments between them. For example, she could share some of her insecurities with him while he holds her hand reassuringly.
You can try some popular fanfiction websites like Archive of Our Own (AO3). There are a large number of fanfics about different pairings, including Noelle x Asta. Just use the search function on the site and type in 'noelle x asta' to find relevant stories.