After losing both his mother and his father, due to a group of villains attacking his home, a young Sly Cooper is sent to a nearby orphanage with his family's cane in hand. There he finds Murray, Bentley, Gilda, and Derpy Hooves, the four people that he would eventually come to call family one day. Together they practice their individual talents and pull off some successful heists, all while searching for clues as to the whereabouts of the Fiendish Five, the people that took out Sly's parents... as well as recover the pages of the Thievius Raccoonus.

All of them must deal with the tests and challenges that come with being in a gang of thieves, especially when some tests will push them to their breaking points.

(Sly Cooper/ MLP crossover)
(Part of the Universe 13 story series, though reading the other stories is not required)

Lyra passes out on her way home one night, but when she wakes up she finds herself in a strange realm of fire, ash, and creatures that she could only refer to as demons. Before she meets what she assumes is her end, she is saved by a group of bipedal creatures that take her to their master, someone named Illidan Stormrage. There she learns what the bipedal creatures are preparing for and is offered a choice; either join them or return to her home.

The problem, she discovers, is that there is another displaced pony wandering the land of Azeroth; so she has to choose between a rock and a hard place. She only hopes that she doesn't regret her choice after making it.

(World of Warcraft; Legion crossover with MLP)
(Part of the Universe 13 story series, though reading the other stories is not required)

Sunset Shimmer almost succeeded in taking over Canterlot High, stopped the Sirens from taking over her new home, and managed to prevent the destruction of two worlds. She feels that she deserves a break and decides to return to Equestria during her summer break. Unfortunately, when she enters the portal she appears in a land that is different from the worlds she's already been to. Now she has to save this world before she can even focus on returning home.

Unfortunately, she's not the only Equestrian that's appeared in this new world, as one of Equestria's most dangerous villains is loose to do whatever he pleases. How will she cope with having to save this new world from Tirek?
(This is a different Skyrim story than my Sombra visits Skyrim story)
(Part of the Universe 13 story series, though reading the other stories is not required)

Jak never found it odd that he and his sister Pinkie were different from everyone in their village, despite the fact that their friend Daxter pointed it out from time to time. Nor did to the trio find it odd that Jak and Pinkie were raised by Samos the Sage, along with his daughter Keira. Jak never questioned how odd their life was, even when he and Pinkie slowly developed the skills necessary to protect themselves from any dangers the world might throw at them.

Pinkie, on the other hand, knows that there are secrets hidden deep in their past... secrets that will change how she and her brother look at the world around them, while fighting to protect it from those that would seek to do it harm.

(Jak and Daxter crossover)
(Part of the Universe 13 story series, though reading the other stories is not required)