Love and affection could be a major theme. The 18 kisses are a clear sign of that. Another theme might be acceptance, as Krillin accepts 18 for who she is, an android, and she accepts him with all his flaws.
Well, it could be about an affectionate relationship between 18 and Krillin. Maybe it involves 18 showing her softer side and giving Krillin 18 kisses as a symbol of her deep love for him. It could also include their daily life together, like how they deal with the challenges in the world of Dragon Ball while maintaining their relationship.
Their relationship could grow deeper as they face the challenges of pregnancy together. Krillin might become more in tune with 18's needs, and 18 could see a new side of Krillin's caring nature.
Bulma could also be a common character paired with Krillin. Bulma is very intelligent and could potentially help Krillin figure out how to time travel better or she might be the one who creates the time - travel device in the first place. And she could use her resources to help Krillin in his time - traveling adventures.
Their relationship can be explored by showing how they support each other in daily life. For example, Krillin could be shown helping 18 with her android - related issues, like dealing with any glitches or upgrades. And 18 could be there for Krillin when he has self - doubt about his martial arts skills.
One possible fanfiction could focus on their daily life together. They might have a sweet morning routine, like making breakfast and chatting about their plans for the day. Krillin could be shown as a very caring partner, always looking out for Android 18's well - being. For example, he might bring her a flower he found during his training, just to make her smile.
One common theme is self - improvement. Krillin is often depicted as constantly striving to get stronger, whether it's through new training methods or unlocking hidden powers.
Maybe a story where 18 and Krillin decide to open a martial arts school. They have to deal with different types of students, and it shows their relationship growing as they work towards a common goal. It can include how Krillin uses his knowledge and 18 her strength to train the students.
The fanfiction could explore their relationship growth over time. How they gradually became closer and more in - sync with each other. It could show how they supported each other through tough times, like when Krillin was worried about protecting the Earth from new threats and Android 18 was there to give him confidence and strength.
The key elements in their love story include the transformation of 18's view of Krillin. She goes from seeing him as just another fighter to someone she can love. Krillin's acts of kindness play a big role. For instance, he might protect 18 even when she doesn't need it. This shows his deep - seated love for her. Their relationship also develops in the context of the Dragon Ball universe, with all its battles and power - struggles, which makes their love story unique.