Maybe a fanfic where Princess Twilight discovers a hidden past of King Sombra that changes her perception of him completely. This could lead to her trying to find a way to redeem him and in the process, they form an unexpected bond.
A time - travel based fanfic would be cool. Princess Twilight travels back in time and meets King Sombra before he turned evil. She tries to prevent his fall to darkness, and in doing so, she has to face many challenges and also deal with her own feelings towards this different version of Sombra.
One idea could be a story where King Sombra is reformed and he and Princess Twilight have to work together to save Equestria from a new threat. They start off distrusting each other but gradually learn to respect and rely on one another.
Their relationship could develop through shared goals. For example, if there is a magical imbalance in Equestria that only their combined magic can fix. As they work towards this goal, they start to understand each other better.
One interesting aspect could be the exploration of their contrasting personalities. Princess Celestia represents light and harmony, while King Sombra is often associated with darkness. Their relationship in the fanfic might involve a struggle between good and evil, or perhaps an unexpected alliance. It could also show how their different powers interact, creating unique storylines.
One idea could be that Twilight discovers a way to redeem King Sombra. She uses her magic and knowledge to break through his dark exterior and find the good within him. Maybe she uncovers a tragic past that led him to become so evil.
One plot idea could be that Twilight has to enter the realm where King Sombra was banished to retrieve a powerful magic artifact. Along the way, she discovers secrets about Sombra's past that make her question if he was truly all evil. Another could be a time - travel plot where Twilight goes back in time and has to prevent King Sombra from ever rising to power in the first place. Maybe she teams up with an ancestor of one of her friends.
One idea could be a story where King Sombra and Shining Armor have to team up against a common enemy that threatens both their kingdoms. They start off as reluctant allies but gradually come to respect each other's skills and strengths.
The theme of forgiveness is also present. Twilight, being the kind - hearted character she is, may be put in a position where she has to forgive King Sombra for his past wrongdoings. This can lead to a deeper connection between the two characters and a new start for King Sombra. Additionally, the theme of self - discovery can be seen, as both characters may learn more about themselves through their interactions.
In 'King Sombra and Twilight Sparkle fanfic', a frequently seen theme is the clash of different magic types. Twilight has her harmonious magic, while Sombra has his dark magic. Their interactions often revolve around how these two magics interact and influence each other. Another theme is the exploration of the gray area between good and evil. Sombra isn't always pure evil in these fanfics, and Twilight isn't always completely good in her approach to dealing with him. There is also the theme of transformation, as Sombra may transform his ways or his form in relation to Twilight's influence.
Perhaps in the fan fiction, King Sombra has a secret past that is linked to Princess Luna. He was once a pony like any other, but a dark magic experiment gone wrong turned him into the monster he is now. Luna discovers this truth and feels a sense of responsibility for him. She tries to reverse the magic that corrupted him. This involves going on a journey to find the origin of the dark magic, facing many dangerous creatures and challenges along the way. And all the while, Sombra is fighting his own inner demons, not sure if he wants to be saved or if he should continue his path of destruction.
You could also focus on a side character from the game. Let's say the Poe Collector. Write a story about his adventures collecting Poes in different parts of Hyrule and how he might get involved in the larger events related to the Twilight Princess plot.
One great 'king sombra and twilight fanfic' could be 'The Redemption of King Sombra'. It shows an interesting take on how King Sombra might be redeemed through his interactions with Twilight. Twilight's character is often used to bring out the best in others in these fics, and this one is no exception.