The other ponies would likely be shocked. Pinkie Pie might initially try to cheer Twilight up, thinking she's just having a bad day, not realizing she's been turned evil. Rainbow Dash would probably be ready to fight Twilight if she poses a threat. Rarity would be horrified at the change in Twilight's appearance and behavior, as it goes against all the elegance and kindness she associates with her.
Fanfiction involving King Sombra and Twilight can offer unique perspectives. King Sombra's backstory of being a dark and corrupted entity provides a great contrast to Twilight's positive and growth - oriented character. In these fanfictions, we might see Twilight using her skills in magic and her strong moral compass to deal with King Sombra. Maybe she tries to understand the root of his darkness and heal it. The fanfiction world allows for creative interpretations where the boundaries of the original story can be pushed, and the relationship between these two characters can be developed in ways that might surprise and engage the readers.
Twilight and King Sombra fanfiction often delves into the themes of good versus evil in a unique way. Since Twilight represents light and knowledge, and King Sombra is the epitome of darkness. Their interactions can be used to explore how far one can go to convert or at least co - exist with the opposite force. Writers can play with this contrast to create engaging stories.
In King Sombra and Twilight fanfiction, a common trope is the 'Forbidden Friendship'. Given King Sombra's dark nature, a friendship with Twilight would be seen as something not supposed to happen. It creates an interesting dynamic as they both come from very different worlds. Also, the 'Teaching' trope is often used. Twilight, with her vast knowledge, might try to teach King Sombra about the values of friendship and kindness. And finally, the 'Danger' trope, where King Sombra's presence always poses a threat to Twilight and her friends, leading to many tense situations in the fanfiction.
One possible plot twist could be that King Sombra actually has a hidden agenda that involves using Twilight's newfound 'evil' status to gain access to a powerful magical artifact. He might make Twilight believe she's acting for a good cause while leading her astray. Another could be that Twilight's friends initially don't recognize her as being under Sombra's influence and unknowingly help her with tasks that are part of Sombra's evil plan.
In Twilight and King Sombra fanfiction, the backstories can be explored more deeply. Maybe King Sombra has a sad past that led him to become evil, and Twilight could be the one to discover it. This could change the whole view of their relationship and the story could go in a completely different direction.
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.
Once upon a time in Equestria, Dark Twilight Sparkle found herself in a strange encounter with King Sombra. Dark Twilight, with her newfound powers, was not afraid to face the menacing King. King Sombra, seeing her as a worthy adversary, tried to tempt her to the dark side. But Dark Twilight resisted, using her knowledge and magic to battle him. Their clash sent shockwaves through the land, yet Dark Twilight remained steadfast in her fight for the light.
One common theme is the power of change. King Sombra is often portrayed as a villain, but in these fanfictions, through his relationship with Twilight Sparkle, he can change for the better. Another theme is the exploration of the unknown. Their relationship is not a typical one in the Equestria lore, so it allows for a lot of exploration into uncharted territory.
There are indeed some interesting ones. However, the quality can vary greatly. Some might focus on a more antagonistic relationship between King Sombra and Twilight, where Twilight has to use her magic and wits to overcome the threats posed by Sombra. Others could take a more unexpected turn and show a possible alliance or even a romantic relationship in a non - traditional sense.