One emotional moment could be when Kono is injured during a mission and her friends fear for her life. They gather around her in the hospital, and the worry on their faces shows how much she means to them.
I've read a few Steve and Kono pregnant fanfictions. In one, the pregnancy was a surprise and it led to a whole new adventure for them. It showed how their relationship deepened as they prepared for parenthood. Another one was more about the challenges they faced, like Kono's health issues during the pregnancy and how Steve supported her through it all.
The ending of 'Koe no Katachi' was a bit bittersweet but also provided a sense of closure. The main characters found some sort of resolution and growth.
Some writers develop Kono's character by making her reflective when she's hurt. She might think about her past actions, decisions she made that led to the situation she's in now. Maybe she regrets some things or realizes she needs to change certain aspects of how she approaches her work or relationships. This self - analysis is an important part of character development in the context of her being hurt in fanfictions.
One interesting concept could be exploring the characters' backstories more in - depth. For example, delving into Shoko's experiences before meeting Ishida in a fanfiction. It can add new layers to her character.
One common theme is the anticipation of the new arrival. It's about Steve and Kono getting ready for their baby, from decorating the nursery to choosing names. Another theme is the support system around them, like their friends and family being there for them during the pregnancy.
First, know the original story well. Understand the personalities of the characters like Ishida's journey from a bully to a repentant person and Shoko's strength in the face of adversity. Then, come up with a unique plot. It could be something as simple as a day in the life of the characters that wasn't shown in the original but still fits the overall tone.