Nana is often portrayed as a strong - willed and independent character in the fanfiction. She has her own opinions and isn't afraid to speak her mind. Igarashi, on the other hand, might be shown as more reserved but very observant. He notices the little things about Nana.
Igarashi could become more open and expressive. In the original story, he might be a bit reserved. But in the fanfiction, he could start to show his emotions more freely, especially towards Nana. For example, he might start writing her little notes or bringing her small gifts. Nana, on the other hand, could grow in confidence. With Igarashi's support, she might be more willing to take risks and try new things, like auditioning for a bigger role in a school play.
Well, it could be about their relationship developing in a sweet way. Maybe they start as friends but gradually realize they have deeper feelings. For example, they could support each other through school events, like when Nana is nervous about a performance and Igarashi is there to encourage her. And then they start to notice little things about each other, like the way Igarashi smiles when Nana is around, and Nana blushes more often in his presence.
One common theme is the exploration of unrequited love. Often, either Nana or Igarashi might be pining for the other while thinking their feelings are not reciprocated. This creates a lot of tension and drama in the fanfics.
A plotline might involve Nana getting into some trouble and Igarashi coming to her rescue. This could lead to a moment of vulnerability for Nana and Igarashi being there to comfort her. It could also be that they get paired up for a dance at a school event and the awkwardness at first turns into a sweet moment as they start to enjoy each other's company.
One popular 'kiss him not me nana x igarashi fanfic' could be 'A Chance Encounter'. It focuses on the unique relationship between Nana and Igarashi, with some really sweet and awkward moments that are very true to their characters in the original work.
Nanashima could be the type to take risks in the relationship. He might be the one to initiate the first move, like asking Igarashi out on a date. Igarashi, though, would be the one to think things through carefully. He might worry about how their relationship would affect their school life and friendships, but eventually give in to his feelings for Nanashima.
One possible plotline could be that Nanashima and Igarashi start off as friends but gradually realize their feelings for each other. Maybe they go on a school trip together and have some special moments that make them see each other in a new light.
A plot idea could be that Igarashi and Kae get paired up for a dance competition. Kae is initially nervous as she's not very confident in her dancing skills, but Igarashi patiently teaches her. As they practice, they start to have feelings for each other that they didn't expect. They then have to deal with their new - found emotions while also preparing for the competition.
Igarashi and Kae's relationship is like a budding flower. Igarashi is like the sun, constantly shining his attention on Kae. He is always there for her, whether it's helping her with something or just being a good friend. Kae is starting to notice his efforts more and more. Their relationship is based on mutual respect and a growing attraction. There are moments of shyness and hesitation, but also of great warmth and connection.
As mentioned before, 'lemon' content is inappropriate, so I can't really discuss the characteristics in that regard. But in general 'kiss him not me' fanfiction, it often focuses on the romantic relationships between the characters, exploring different scenarios and emotions within the context of the anime's story and characters.