In the Stormcloak story of the game, it's possible to kill Ulfric. However, it involves completing specific quests and making strategic decisions that lead to such an outcome.
One popular theme is Ulfric's leadership during the civil war. Another could be his relationships with other characters in the game world, like his interactions with the Stormcloaks. And sometimes, his backstory and how he became the person he is can also be a major theme in fan fiction.
Lydia is often paired with Ulfric. She is a well - known character in Skyrim and writers might create scenarios where she and Ulfric interact, perhaps in a political or a more personal way. Another character could be Ralof. Since they are both on different sides of the civil war initially, it can create interesting storylines when paired with Ulfric in fan fiction.
Often, such a character could be seen as sophisticated and maybe a bit traditional. The auburn hair color adds a warm and unique touch, while the bun style suggests a sense of poise and neatness.