One popular Sylvanas x Nathanos fanfiction might be 'The Bond Beyond Death'. It delves into their relationship in the afterlife. Another could be 'Love in the Shadows of War', which explores how their love endures through the chaos of battle. There's also 'Soulmates in the Forsaken Realm' that focuses on their deep connection as two key figures in the Forsaken society.
You can start by searching on fanfiction websites like Archive of Our Own. Just type in 'Sylvanas x Nathanos' in the search bar and a whole list of relevant fanfictions will come up. Another option is to check out some Warcraft - related forums where fans might share and recommend their favorite Sylvanas x Nathanos stories.
One possible theme could be the clash of two different worlds. Naruto is from the ninja world full of chakra and unique jutsus, while Sylvanas is from the Warcraft universe with magic and undead. Their meeting could lead to a theme of cultural shock and adaptation.
I'm sorry I can't directly recommend specific 'naruto x sylvanas windrunner fanfiction' as there are so many out there. But you can start by looking on popular fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just search for the relevant tags and you might find some interesting stories.
One great example could be a story where Jaina and Sylvanas are forced to team up against a common enemy. They start off distrusting each other due to their past differences. Jaina, the powerful mage, and Sylvanas, the undead ranger - general, find that their combined skills are needed to save Azeroth from a new, powerful threat. As they work together, they begin to understand each other's motives better and a grudging respect forms between them.
Sylvanas' vengeful nature can clash with Jaina's desire for peace. In many fanfictions, this clash is the starting point of their relationship development. Sylvanas may see Jaina's peace - seeking ways as naive, while Jaina may view Sylvanas' actions as overly aggressive. However, as the story progresses, they might find common ground. For instance, they both care deeply about the future of Azeroth in their own ways, and this shared concern can be the bridge that brings them closer together. Their different personalities add depth and drama to the fanfiction stories.
In a Percy Jackson and Sylvanas Warcraft fanfiction, Sylvanas might view Percy as a potential ally or threat. Given Percy's demigod status in his own world, his powers could be on a different scale compared to the denizens of Warcraft. The story could revolve around how Percy adapts to the Warcraft setting, its magic, and politics, all while Sylvanas is watching his every move, perhaps with an ulterior motive.
Another theme is redemption. Some fanfictions use Sylvanas' presence in the Harry Potter world as a way to explore her redemption arc. In the Warcraft lore, she has a complex and often dark past, and in the Potterverse, she might find a new path to atone for her actions.
The Ents could be an interesting potential ally. Their connection to nature and their power could be something that Sylvanas would want to harness for her own ends. On the other hand, the Uruk - hai, with their brute strength and loyalty to the dark forces, would almost certainly be enemies. Their chaotic and violent nature would be in direct opposition to whatever plans Sylvanas has in the fanfiction.