Link from The Legend of Zelda series could be a really cool crossover. Link's use of various items and his connection to the Triforce could create some unique scenarios when combined with Connor's abilities. They could be in a world that has elements of both Hyrule and Connor's colonial America.
Altair Ibn - La'Ahad would be an excellent choice. Since they are both from the Assassin's Creed franchise, it would be interesting to see how their different time periods and experiences shape their interactions. Altair's more traditional Assassin ways could contrast with Connor's more nature - influenced style.
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.
One idea could be a crossover with Ezio Auditore. They could team up to face a new, powerful Templar threat that spans across different time periods. Imagine the two assassins sharing their unique skills and knowledge.
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.
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.
A great place to find Connor Kenway fanfiction is Archive of Our Own (AO3). It has a large collection of fanfictions across various fandoms, including Assassin's Creed with many dedicated to Connor. Fanfiction.net is also a good option. It has been around for a long time and has a decent amount of Connor Kenway fanfics.
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.
A third idea is that Connor time - travels to a post - apocalyptic world. Here, he has to use his survival skills and assassin training to help the remaining survivors. He could also try to find a way to restore the world to its former state, all while facing new and dangerous threats.
The Age of Exploration could be another good setting. Connor could board ships and travel to new lands. He would face new enemies, such as pirates, and might also discover ancient assassin secrets hidden in far - off places.