Image imported from ponerpics 
Original Description:
 
Friendship Is Magic: The Next Generation begins thirty years after the birth of Princess Flurry Heart, and the story is… a bit darker and more complicated than My Little Pony: Friendship Is Magic before it. It delves into the backstory around Alicorns, where they came from, why Discord is the only Draconequus, and who is the prisoner in the deepest darkest cell of the cosmic oubliette that is Tartarus…  
(And admittedly, FIM:TNG does take some liberties with the events of MLP:FIM, mostly in regards to Equestria Girls and all episodes after and including The Cutie Re-Mark. That will become more apparent when it comes to the character bios for Sunset Shimmer, Flash Sentry, Starlight Glimmer, and others.)
 
This is Sparkler Surprise, also known as Sparkly or Sparky or Spark or Sparkers, Rarity & Pinkie Pie’s daughter. Despite her size, she is 20 years old, only a few years younger than her close friend Shamrock Apple. She lives in a party goods store right next door to Sugarcube Corner, which her Mommy Pinkie currently runs while Carrot & Cup Cake have expanded their business to other towns following the Storm King’s defeat, after the influx of new species led to many new travelers through Equestria.
 
Sparkler’s special talent is in the production of party goods, such as party poppers, balloons, balloon-filling air tanks, party cannons of all sizes, etc. She borrowed Mommy Pinkie’s blueprints for the party cannon (drawn up after the act of actually building the party cannon) and miniaturized it to be worn on the hoof, while still provided just as much party material. She has also optimized the air pressure involved to allow for more efficient spreading of sparkles, glitter, balloons, and confetti.  
Sparkly’s cutie mark on its own
 
Sparkler has the same sort of misaligned eyes as Ponyville’s beloved Ditzy Doo, and just like the famed (albeit klutzy) mailmare, she has opted out of glasses or corrective magical surgery. It has not affected her ability to live life or to work as a party goods proprietor, so why in the world should she take eyewear or do funny magic things to her eyes?
 
Hoooo boy is Sparkers a pony for physical affection. Any day that passes when she has not given each of her friends at least ten big strong hugs is a day wasted in Sparkler’s opinion. And she much prefers to surprise them as to where or when the hugs will come in. She may or may not have inherited a small degree of Pinkie’s Pinkieness with regards to being where ponies shouldn’t be or appearing where she couldn’t have possibly appeared. She loves absolutely everypony in Ponyville and is almost like her Mommy Pinkie in miniature (literally) except for the wings and mayyyybe a tinge less exuberance. Her mane does not deflate when she is in a depressive mindset, though, unlike Mommy Pinkie. As far as she’s concerned, there are no bad guys in the world, just more people to hug and make friends with.
 
As a filly, she tended to fly or trot in crooked paths, courtesy of her “traitorous” Lefty telling her the wrong way to where things were and how far they were from her. Mommy Rarity was insistent that something be done about his, but Mommy Pinkie and honorary aunt-in-strabismus Ditzy Doo won out in the end, and Sparkly was able to grow up free of the shackles of glasses or corrective surgery.  
She refers to Pinkie Pie as Mommy, Rarity as Mommy, and Rainbow Dash as Mommy.
 
Sparkler Surprise’s coat is a blend of her grandmother Cloudy Quartz’s coat with her aunt Sweetie Belle’s mane color (the purple parts). Her eye color comes from her aunt Maud Pie’s mane color, slightly saturated. Her mane color comes from her grandmother Cookie Crumbles’s coat color and her aunt Marble Pie’s eye color. The party popper string in her cutie mark takes its color from Rarity’s cutie mark, and the little diamond confetti pieces from Pinkie’s cutie mark. The party popper itself takes its colors from Cloudy Quartz’s glasses frames, and from Sweetie Belle’s magic color.
 
The rainbow streaks in her mane and tail, huh? Well, Sparky and the other children of the Mane Six from Friendship Is Magic bear the mark of the Rainbow Power their mothers earned from the Tree of Harmony. The colors come from the coat colors of each of the Mane Six. She feels like she is quite capable of magic towards great harmony when she is close to the other three children of the Mane Six and she is more than willing to share, but there is just something missing there. Do they need six to do this…?
 
Her mommies Rarity & Pinkie were a strange match to so many in Ponyville; how could a prim and proper diva like Rarity possibly fall in love with a raucous and unrefined mare like Pinkie Pie? Friends was already kind of stretching it. But anypony who could see them together knew that a purer love could not exist. Rarity fell in love with Pinkie that day she helped reproduce her favorite book from her fillyhood, as bizarre and almost grating that day was. As Pinkie said, the smoothie stain was another way to remember they day she fell in love . It’s harder to guess when Pinkie fell in love with Rarity; maybe she always loved her, even when she was infatuated with Rainbow Dash? It’s always hard to guess with Pinkie Pie; she can be as hard as a jawbreaker one moment and as pliable and stretchy as rubber the next. But it was during their visit to Manehattan to help Rarity pick out a locale for her new boutique that they realized they were in love, and their follow-up visit to help out Saffron Masala and her father that they first dated. They were the first of the Mane Six to officially seal the deal as a couple, even before Rainbow Dash & Fluttershy who’d known each other far longer.
 
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Since my Duchess Skystar was uploaded here, I decided to get on with uploading the rest of the Friendship Is Magic: The Next Generation cast.