Some of my Favourites

• Hail to the King A human soul is stuffed into King Sombra's body. Having no idea what's going on, and thinking he is in some kind of coma, he just casually strolls into the Crystal Empire. by Qwapdo 85,508 words · 5,800 · 105
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  Feeling Pinkie Mean Sombra has met his match, literally. by RainbowBob 33,575 words · 1,952 · 42
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  MIA After activating the slipspace drive Jorge is teleported to a strange new world. by Gravitys Rainboom 198,031 words · 2,867 · 86
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  Regarding Falling Villains Given the successful befriending of Discord, Princess Celestia deems that no longer will villains be defeated but instead reformed. Brought back from the dead and stripped of his powers, Sombra only wishes he could have stayed dead all along. by naturalbornderpy 106,940 words · 1,026 · 40
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  Before the Dawn When two unlikely ponies, Luna and Sombra, meet beneath the silver moon, will their love be everlasting, or will the darkness lurking in the Crystal Empire succeed in destroying them? by SilverMuse 102,232 words · 114 · 6

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  The Bridge: A Godzilla-MLP Crossover A devastating battle in the Kaiju universe transports a small group of them, heroric, villainous, and otherwise to Equestria. New bodies, new world, new society. But what happens when something even Kaiju are afraid of follows them? by Tarbtano 1,161,185 words · 2,062 · 80
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  Sweetie's Shadow Looking for a way to get over her fear of public speaking, Sweetie Belle borrows an instructional book from Twilight's library to help out. One thing leads to another and some how ends up binding King Sombra to her as her shadow... by Note Sketch 123,832 words · 2,388 · 43
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  Lingering Shadows Love can be one of the most powerful forces in the world...but it's also a deadly, sweet poison, as Princess Luna is about to learn... by Yoru-the-Rogue 36,888 words · 504 · 14
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  The Not-So-Normal Adventures of King Sombra and Pinkie Pie Sequel to "The Cake Batter Incident". An unlikely bond is formed when Pinkie is tasked to reform Sombra, the ex-king of the Crystal Empire. by Harmony Charmer 91,519 words · 981 · 26
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  All Hail The Dark Lord Darth Vader, one of the most insidious villains in the entire galaxy, ends up in Equestria of all places. With no support from the Empire, this Sith Lord needs to find a way off the planet. Or he could take over it. Either one works. by RainbowBob 39,796 words · 1,922 · 66

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  Friendship is Grievous All welcome the latest visitor to Equestria... General Grievous? by Snake Staff 87,293 words · 1,328 · 90
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  The Missionary Follow a man, surviving in equestria with nothing but his wits and his faith, oh and his own town. by Radon18 109,381 words · 460 · 62
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  In Their Highnesses' Clandestine Corps The name's Blueblood. Prince Blueblood. by AugieDog 28,733 words · 313 · 11
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  Shadowy Love King Sombra, the tyrant of Crystal Empire is back, only to be imprisoned by princesses and put through reformation with Twilight Sparkle as his teacher. Can somepony with heart as black as night be reformed? Twilight believes so. by FinnPony 128,628 words · 697 · 34
• Bringing Up Blueblood A spinoff of "My Little Alicorn." Blueblood must prove himself worthy of being an adult a by InsertAuthorHere 158,939 words · 1,276 · 16