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.
One idea could be focusing on Krillin's over - protective nature during 18's pregnancy. He could be constantly worrying about her safety and the baby's well - being, like making sure she has all the right nutrients and is not overexerting herself.
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.
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.
Krillin is depicted as a brave but often underestimated character in the manga.
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.
In fanfiction, Krillin and Android 18's love story is really sweet. They first met as opponents. But over time, Krillin's kindness and his genuine care for 18 made her start to see him in a different light. They gradually developed feelings for each other, and their relationship is often depicted as a beautiful example of love that overcomes differences.