In the fanfic, both characters could be developed through their shared experiences. They might face a life - threatening situation together, like a disease outbreak on the Ark. This would force them to rely on each other, and in the process, they would learn more about each other's strengths and weaknesses. Bellamy could learn from Clarke's medical knowledge and strategic thinking, while Clarke could learn from Bellamy's street - smart skills and ability to gain the loyalty of others.
Bellamy's character could be developed by showing his growth from a more self - centered person to someone who truly cares about the well - being of the Ark as a whole. For example, he might start off only concerned with protecting his sister, but through his experiences with Clarke, he begins to see the bigger picture.