The rogue could be a disgruntled ex - knight who was wrongfully banished from his order. He sees kidnapping Lucy as a way to get revenge on the kingdom or the people who wronged him.
Well, I've read 'Lucy and Laxus: The Unexpected Bond'. It's a great fanfiction where they start off as just comrades in the guild but gradually develop a deeper connection. The author does a wonderful job of showing how their personalities complement each other. There are some really sweet moments between them as they face various challenges together in the story.
Another theme is often about power and how they support each other in terms of their magical abilities. Since they both have different powers, in many fanfictions, they combine their strengths to overcome difficulties. For example, Lucy's celestial magic and Laxus's lightning magic can be used in creative ways to defeat enemies. Also, the theme of loyalty to each other and to the guild is quite prevalent. Their relationship is often shown as a source of strength for the entire guild, and they are loyal to one another through thick and thin in these stories.
One idea could be that Future Rogue travels back in time and meets Lucy before the events of the main story. He initially hides his true identity but gradually forms a bond with her as they go on adventures together. They might face a common enemy that only their combined powers can defeat.
Lucy, on the other hand, might become more independent yet also more vulnerable. She is used to being strong on her own, but now she has to rely on Rogue and others more. This pregnancy could also strengthen her magical powers in some unexpected ways as her body is changing due to the pregnancy.
One idea could be that Rogue discovers Lucy is pregnant and is initially in shock but then becomes extremely protective. He might start learning about how to take care of a pregnant woman and the coming baby. For example, he could read books on pregnancy and baby care in secret.
For Future Rogue, his personality could be developed by showing his struggle with his past actions in the future. When he meets Lucy, he could start to soften and become more open. Lucy, on the other hand, could grow in confidence as she teams up with Rogue. She might become more assertive in battle and in decision - making.
Often, in 'Lucy and Rogue kiss fanfiction', there is a theme of overcoming obstacles. This could be things like differences in their personalities or social status within the fictional world. The kiss then becomes a symbol of breaking through those barriers. There may also be a theme of self - discovery, where through their relationship, both Lucy and Rogue learn more about themselves.
One common theme is adventure. The dragon and Lucy often embark on exciting journeys together. Another theme is the power of their bond. It might give them special abilities or help them overcome difficulties.
There are quite a few. You can check some popular fanfiction websites like Archive of Our Own. There you might find stories where the relationship between the dragon and Lucy is full of adventure, magic, and emotional depth.