Twilight, Starlight, Cozy and their brother Jak, along with their friends Keira and Daxter, spend their days playing around the village, helping the other residents of Sandover whenever they can, working on their hobbies, and occasionally learning from Samos, the Green Sage that calls their village home, even though Daxter often gets him and the others in trouble whenever they do anything interesting. That doesn't stop them from having fun and learning a few skills to defend themselves, all while unaware of the grand adventure that they'll be embarking on in the near future, along with the fact that the fate of the world depends on their actions to come.

(Jak and Daxter/MLP crossover)
(Part of the Demon War story series, though reading the other stories is not required)

During a trip to Ponyville, to relax after a long week, Spitfire suddenly finds herself in an unknown world, one that seems broken and filled with conflict, along with monstrous creatures that had to be demons. From that point forward she encounters the Illidari, demon hunters that have pledged their lives to hunting down the demons and ending their crusade across the universe, only to eventually fall in with them to protect her home world from eventually becoming a target of the Burning Legion. Not long after that she discovers Illidan Stormrage, the leader of the Illidari, has a plan to bring down the leaders of the Legion and bring their crusade to an end, only for fate to throw a couple of wrenches into their plans, including another lost Equestrian, forcing them to delay their plans for a number of years before they can act against their enemies.

Once they're ready Spitfire, along with Rainbow Dash and their new allies, will do everything in their power to bring down the Legion and save all of creation in the process.

(World of Warcraft: Legion/MLP Crossover. Will include a heavily modified Battle for Azeroth)
(Part of the Demon War story series, though reading the others isn't required)

Tirek thought it was over when the mares he thought he had defeated used the powerful rainbow power of Harmony against him, stripping him of the power he had stolen from the ponies of Equestria, while no doubt sending him back to his cell in Tartarus. Fate, however, seemed to have other plans for him as he found himself buried under the ground, in a shallow grave that he had to pull himself out of, just as a bell tolled, and in a foreign land that he knows nothing about. At the same time he discovers that he wasn't the only one buried, as a fallen warrior also pulls herself from the grave and sets off on her own personal quest, while also finding out that they are both undead in some manner and that fate has big plans for them.

He and his unlikely companion must band together for the foreseeable future and tackle the dangers of this world, all while Tirek searches for the power that will allow him to break his condition, regain his true power, and then conquer the world, or die trying.

(Dark Souls 3/MLP Crossover)
(Part of the Demon War story series, but reading the others isn't required)

Spike and Ember are transported to the Artisans homeworld as infants, without any memories at all, and arrive in time for Spyro's egg to hatch, leaving Nestor and the other Dragon Leaders with two purple dragons and a blue dragon, instead of just a single purple dragon. They decide to take it as a sign of great things to come and keep the trio together, letting the three dragons grow up as siblings while they teach them the value of teamwork and what it means to be a dragon, all while preparing them for whatever the future has in store for them.

(Spyro Reignited/MLP Crossover)
(Part of the Demon War story series)
Edit: Dislike free from May 21st to August 1st

This story is a sequel to Dragon Ball Z: Daughters of Destruction

Sunset Shimmer thought it was over when the last of the displaced ponies returned to Equus and resumed their normal lives, even though she was the God of Destruction for their universe, the newly official Universe 13. What she wasn't expecting, however, was for the Grand Priest to call all the Gods of Destruction, their Angels, and the thirteen Kaioshin to Zeno's palace for an announcement that would change the face of the thirteen universes. There they discover that multiple universes would be required to take part in the Tournament of Power, where teams of ten from the chosen universes would be all that stood between that universe surviving or being erased from existence.

Even as the displaced ponies gather together for one last adventure, to save their universe in case they were called to battle once more, they know they must be careful, as the other universes weren't to be underestimated... and there was no telling just how powerful the fighters from the other universes would be.

(Dragon Ball Super/ MLP Crossover)
(Finale of the Universe 13 story series.)

Sombra, the dreaded King of Darkness, was defeated and his body shattered, but his dark soul survived the return of the Crystal Empire and went into hiding. Some time later it found a path between worlds, a mirror portal, and arrived in a place called Hueco Mundo, where it gained a new body to start a new life. In the process Sombra loses his memories and becomes a shell of his former self, searching for something that he knows that he lost while having no idea where to find what he was missing.

Along the way he somehow finds his way to Karakura Town, into the hands of Kisuke Urahara, and learns more about his new body than he could have learned on his own, before coming into contact with Ichigo Kurosaki and his small group of friends. From there he starts an epic journey to help them save another friend from a terrible fate, fight the people that were in their way, and face an evil that was hiding in plain sight at the same time... along with finding out what happened to his missing memories.

(Bleach/ MLP Crossover)
(Part of the Universe 13 story series, though reading the other stories is not required)
(Also, the story will not include the Fullbring or the Thousand Year War Arcs)