It might start with a misunderstanding. The OC Prince could be misjudged by Kallen due to his association with Britannia. But as she gets to know his true nature, which might be that he is actually sympathetic to the oppressed, their relationship can grow. They could have heart - to - heart conversations about their hopes and dreams for a better world, which would bring them closer.
The relationship could develop in the heat of battle. The OC Prince and Kallen could find themselves in a life - or - death situation. In that moment, they realize how much they care about each other's safety. This realization could be the starting point of their romantic relationship. From there, they would continue to support each other in their respective roles in the ongoing conflict in the Code Geass universe.
Their relationship could develop through shared goals. For instance, if they both aim to overthrow a corrupt regime within Britannia. Working side by side towards this common objective would make them rely on each other, leading to mutual respect and eventually love.
Well, in 'Code Geass OC x Kallen fanfic', loyalty is a big theme. The OC might have to prove their loyalty to Kallen and her cause. Another theme is the idea of sacrifice. In the world of Code Geass, characters often have to make sacrifices for the greater good. The OC could be in a situation where they have to sacrifice something for Kallen or their shared goals. And of course, the theme of acceptance is there too. Kallen might need to accept the OC, who could be very different from the people she usually associates with.
One possible plot idea could be that the OC Prince, who might be from a different region or have a unique background in the Code Geass universe, meets Kallen during a battle or a political intrigue. Their initial encounter could be filled with suspicion and hostility, but as they are forced to work together, they gradually develop feelings for each other. For example, they might have to team up to rescue a mutual friend or stop a new threat to Britannia and the Black Knights.
Kallen might also develop a stronger sense of leadership. In a new time period, she may have to take on different roles and responsibilities. This would force her to grow as a leader. She could learn new strategies and ways of dealing with people, which she could then bring back to her own time to better lead the Black Knights.
In many fanfictions, their relationship starts from comrades in arms. They are both fighting for the same cause against Britannia. As they face more and more difficult battles together, they start to understand each other better and a deeper bond forms.
In many fanfictions, their relationship often starts from mutual respect. Kallen respects Lelouch's strategic mind, and Lelouch admires Kallen's strength. For example, in some fanfics, they start to rely on each other more during difficult battles, which deepens their bond.
This fanfic idea presents a very interesting twist on the original Code Geass story. It would be exciting to see how the story unfolds with Kallen on the side of Britannia. Her skills and abilities could be used in different ways. For example, she could use her piloting skills to fight for Britannia against new threats, which would completely change the power dynamics in the Code Geass universe.
The Black Prince's character could develop through facing various moral dilemmas. For example, he might be forced to choose between loyalty to his family and doing what is right for the greater good. This would make him question his values and beliefs, leading to growth.
One way to find good 'Code Geass OC x Kallen fanfic' is to check fanfiction websites like FanFiction.net or Archive of Our Own. Search for the specific pairing and look at the stories with high ratings and reviews. Some might be centered around an original character's journey and their relationship with Kallen in the Code Geass universe.
The 'Code Geass Kallen Expansion Fanfic' is probably about taking Kallen's character from Code Geass and building on it. It could be a story that gives more screen time to her motives. Maybe it shows how she became so dedicated to the cause of the resistance. It could also detail her relationship with Suzaku from a different perspective. It might add more depth to her character by showing her making difficult decisions that were not shown in the original series and how those decisions shape her future in this fan - created expansion.
C.C. might view it with a sense of detachment at first. But then she might realize that Lelouch is becoming more attached to Kallen in a way that could potentially change their own relationship. She might start to feel a bit left out or even jealous, as she has been by Lelouch's side for a long time and has her own unique bond with him.