Novela negra basically means a type of novel that focuses on crime and mystery. These novels usually have a lot of twists and turns to keep readers engaged and guessing until the end.
In non - adult interpretations of Sombra - related fanfic, Sombra is often depicted as a highly intelligent and mysterious character. Her hacking skills are usually a central part of the story, whether she's using them for good or for more morally ambiguous purposes within the Overwatch universe.
Celestia is often paired with King Sombra. Their power levels are somewhat similar, and they represent opposite sides of good and evil, so it makes for an interesting dynamic. Twilight Sparkle is also a common character to be paired with him. Given Twilight's knowledge of magic, she could either be in a battle of wits with Sombra or trying to understand his magic for some reason.
Well, King Sombra's origin story is intertwined with the history of the Crystal Empire. He was a being filled with envy and a lust for power. He might have once been a part of the Equestrian society, but his ambition and the allure of dark magic turned him into a tyrant. His origin story shows how a pony can be corrupted by negative emotions and the wrong kind of magic. He first emerged as a threat when he targeted the Crystal Empire, using his powers to shroud it in darkness and drive out its inhabitants. The ponies had to fight hard to keep him at bay, and his origin story serves as a cautionary tale about the dangers of greed and the misuse of magic in the world of Equestria.
One aspect to consider in this fanfiction could be the character development. Twilight is often portrayed as a studious and kind - hearted character. In a story with Sombra, her intelligence might be used to outwit Sombra's more devious plans. For example, if Sombra tries to take over Equestria again, Twilight could use her magic knowledge to counter his dark spells.
One great MLP Sombra fanfic could be 'The Redemption of Sombra'. In this fanfic, Sombra is given a chance to reform and find his place in Equestria. It shows his internal struggles and how the ponies around him gradually accept his change. It's really engaging as it delves deep into Sombra's character, which is often overlooked in the original series.