Twilight Sparkle is a unicorn that has just moved from Canterlot to Ponyville. She has made 5 new friends, a blue pegasus pony named Rainbow Dash with a messy rainbow mane and tail and her cutie mark is a rainbow coloured lighting bolt coming out of a white cloud, another pegasus called Fluttershy who is yellow with a slick light pink mane and tail, her cutie mark is 3 cyan butterflies with pink wings.
Her other friends are 2 earth ponies, one called Applejack and one called Pinkie Pie, Applejack is orange with a yellow mane and tail, tied at the ends with a red hair tie and her cutie mark is 3 red apples with green leaves. Pinkie Pie is light pink with a puffy dark pink mane and tail, she has 3 round balloons for a cutie mark, the two at the sides are blue with yellow strings, while the one in the middle is yellow with a blue string.
Finally there is Rarity, a fellow unicorn that is white with a curly royal purple mane and tail. Three blue diamonds adorn her flank as a cutie mark.
She still has one friend from Canterlot, Spike, a purple baby dragon with green spines and Twilight's #1 assistant. All is well.
Twilight Sparkle moved from the city of Canterlot to a town in the countryside called Ponyville with her dragon assistant, Spike, a long time ago now. Here she faces alot of foes and with the help of her pony friends ultimately comes out victorious in the end, time and time again. She has made many new friends here in Ponyville, but none of them can really match up to the 5 amazing mares she met when she first moved here. She even ended up being a bearer of the elements of harmony with them! They are her best friends in the whole of Equestria. All is well.
Twilight Sparkle has now officially been crowned Princess Twilight Sparkle by Princess Celestia, the ruler of the entirety of Equestria along with her younger sister Princess Luna. She has become an alicorn and so she has grown pegasus wings as she was a unicorn before, grown taller, her horn has grown longer and her magic has become even more powerful than before. All is well.
Some time has passed... Well, around 60 years! Princess Twilight Sparkle has become older, wiser and more powerful. The same goes for her friends. Princess Celestia informed her that she will not outlive her best friends, and that they will not pass away due to old age when she first became an alicorn. That relived her, as that was one of her worries. Her friends don't even look as if they've aged a single bit, nor does she! All but Spike.
Spike's psychical appearance has more than changed. He has over quadruped in size, and has sprouted huge, leathery bat wings, sporting a large, long talon on each were the wing splits into different digits. The spines on his head, running all the way down to his tail, have grown bigger and are sharper, he has grown large horns at the sides of his face, getting smaller as they go down. His claws and teeth have grown into curved talons and gleaming fangs, deadly sharp and incredibly long. His entire body is now covered a in purple armour, his scales. They are alot harder and resilient than his soft baby scales. He has become alot stronger, his massive wingspan can send him soaring up to cloud level in just a few strokes, he can crush most objects by simply coiling his long neck or tail around them and squeezing a little, his powerful legs can send him forwards at incredible speeds in a bound or two and in the water he is as slippery and evasive as a fish, moving his way through the water better than even Gummy though he is less hydrodynamic, using his tail as a rudder to control his direction through the liquid, swimming seemingly effortlessly by simply just tucking in all six limbs and moving his body in a rippling motion.
Understanderbly, many ponies are afraid of Spike at first, but they soon warm up to him. All is well.