Begin by creating a conflict that involves both Edward and Connor. It could be a new Templar threat that has roots in Edward's time and resurfaces in Connor's. Develop their characters further by giving them internal struggles. Maybe Edward is haunted by his past actions as a pirate, and Connor is struggling with his identity as an Assassin in a changing world. As you write, keep the pacing right. Alternate between action - packed scenes and more reflective moments. And most importantly, let your love for the Assassin's Creed series shine through in your writing.
A fanfiction could be about family ties. Maybe Connor discovers he has a distant relative who was part of Edward's crew. He sets out to find this person and in the process, uncovers more about his family's past. Along the way, he meets Edward's ghost or some kind of spiritual manifestation of him. Together, they work to protect a hidden Assassin stronghold from the encroaching Templars.
One possible plot could be that Connor, being from a later time in the Assassin's Creed timeline, stumbles upon some ancient records or a hidden memory that leads him to Edward. They might initially be at odds due to their different time periods' ways of life. Edward, being more of a swashbuckling pirate - assassin, could teach Connor some new combat techniques or ways of navigating the high seas that Connor hadn't experienced in his mainly land - based adventures. They could also bond over their shared goal of fighting the Templars, with Edward sharing his experiences from the earlier days of the conflict and Connor bringing in his knowledge of the more evolved Templar plans in his time.
Connor's solemn nature and his focus on the greater good of the Assassin Brotherhood would be quite different from Edward's more self - interested and thrill - seeking personality. However, when they meet in a fanfiction, they could start to influence each other. Connor could teach Edward about the importance of a long - term strategy for the Assassins, while Edward could show Connor that it's okay to have a bit of fun and be more spontaneous in his actions. Their different personalities could lead to some interesting debates and exchanges, like when they discuss how to approach a Templar target. Connor would want a carefully planned infiltration, while Edward might suggest a more direct and risky approach, which could lead to a compromise in their combined tactics.
Another possibility is a former crewmate turned traitor. This crewmate could have been jealous of Edward's leadership and the share of the loot he got. So, the traitor could plot with other pirates or even the enemy. They could stage a mutiny at a crucial moment, like when they are about to face a big battle or are in the middle of a difficult sea journey. During the mutiny, the former crewmate could be the one to deliver the fatal blow to Edward.
A new villain could be introduced in the fanfic who is specifically out to get Connor Kenway. This villain might have a personal grudge against Connor or be on a mission to eliminate all the Assassins, and Connor becomes their prime target and ultimately falls to their schemes.
The Kenway family has a complex and interesting story. Edward Kenway was a pirate. He was adventurous and his actions had a great impact on his family's future. His son Haytham became a Templar. Their relationship was full of twists and turns, with different ideals pulling them in different directions.
One great Connor Kenway fanfiction is 'The Hidden Path'. It delves deep into Connor's character, exploring his internal struggles as he tries to protect his tribe and the colonies. Another one could be 'Connor's Redemption', which shows a different side of his journey, focusing on how he copes with the consequences of his actions. And 'Connor Among the Ancients' is also interesting as it places Connor in various historical and mythical situations.
There's a good chance Haven Kenway is the lead. However, sometimes in novels like these, the definition of a protagonist can be fluid and might change as the story progresses.
When it comes to navigation, Nami would be interested in Kenway's knowledge of different sea routes and hidden islands. Kenway could learn from Nami about the unique weather patterns in the One Piece world. Also, Chopper would be curious about Kenway's health and any medical knowledge he has from his time as a pirate. Kenway, in turn, would be entertained by Chopper's cute and innocent nature.