Logan can be developed by showing his moral journey. He might start as a morally ambiguous character but through his experiences with the princess, he becomes a better person. The princess can be developed by showing her in different situations. For instance, when dealing with commoners, she could learn about their problems and this could change her perspective. This would add depth to her character in the fanfiction.
To develop Logan, you could explore his relationships with other characters in the Fable 3 world. For example, if he has a mentor, how has that relationship shaped him? For the princess, give her internal conflicts. Maybe she has to choose between her duty to the kingdom and her love for Logan. This will make her character more three - dimensional.
For Logan, you can start by giving him a backstory. Maybe he had a tough childhood that made him strong and resourceful. His actions in the fanfiction can then be influenced by this past. For the princess, show her growth from a sheltered royalty to a strong leader. She could learn from Logan's street - smart ways and he could learn about courtly manners from her.
One idea could be a story where Logan, who is often seen as the antagonist in Fable 3, has a change of heart due to the influence of the princess. X could be a mysterious force or item that brings them together. For example, the princess discovers that Logan has been secretly trying to protect the kingdom from a greater threat that no one else is aware of, and X is the key to unlocking the truth about this threat.
If Logan is a warrior and the princess is in need of protection, he could be assigned to guard her. At first, they might not get along well. The princess could find Logan too rough around the edges, and Logan might think the princess is too pampered. But as they face battles together, Logan sees the princess's courage and intelligence in strategic planning, and the princess sees Logan's loyalty and selfless acts of protection. This mutual admiration can lead to a deeper relationship.
X could play the role of a catalyst. For instance, if X is a magical amulet that Logan discovers. He initially wants to use it for his own gain but then realizes that it could be a powerful tool to help the princess save the kingdom. This realization makes him change his attitude towards the princess and they start to work together.
One idea could be that Logan, a commoner in the world of Fable 3, saves the princess from a dark magic spell. As he breaks the spell, they start to have a connection. He then accompanies her on a journey to restore peace to the kingdom which has been ravaged by the aftermath of the spell. Along the way, they face challenges that test their relationship and grow closer.
One idea could be that Logan is a commoner who discovers he has a special power that is connected to the princess in Fable 3. They meet by chance when the princess is on a quest to find a solution to a dark magic that is plaguing the kingdom. Logan uses his power to save the princess from a dangerous creature, and from there, a bond begins to form between them as they work together to save the kingdom.
Next, build on their shared experiences. If they are on a journey together, show how they react to the same situations differently. Maybe they come across a poor village. The Princess immediately wants to help, but Logan is more skeptical. As time passes, show small changes in their views due to each other's influence. For Logan, he might start to see the value in the Princess's kindness. For the Princess, she might understand Logan's need for power as a result of his insecurities.
One plot idea could be that Princess and Logan are forced to team up to save Albion from a new, unseen threat. Maybe a dark magic has started to corrupt the land and they have to put aside their differences. They start off distrusting each other but as they face challenges together, they begin to understand each other's motives better.
Another way is through an injury or a crisis. If Logan gets seriously injured, Harry could use his unique skills (maybe some kind of healing ability or just his resourcefulness) to save Logan. This act of selflessness would make Logan more open to Harry, and from there, they could start to share their life stories, dreams, and fears, gradually building a strong bond between them.
For Logan, his character could be developed by showing his vulnerability. Usually seen as tough, in the context of the first time with Veronica, he could be nervous and show his softer side. For example, when he tries to ask Veronica out on a proper date for the first time, he stutters a bit, which is a new side of him.
You can also develop their characters through their relationship with each other. The flower princess could teach the lemon about elegance and kindness, while the lemon could teach the flower princess about being more outspoken and standing up for herself. Their relationship can be a catalyst for their individual growth, which can be a great way to develop them in fanfiction.