Depiction in the seriesEdit
Twilight lives in Canterlot until Princess Celestia sends her and Spike to Ponyville to oversee the preparations for the Summer Sun Celebration and make some friends. Twilight befriends the rest of the main characters, and remains in Ponyville to continue to study the magic of friendship. In A Canterlot Wedding - Part 1, Twilight says that Princess Cadance was her foalsitter when she was a filly.
Twilight tells the Cutie Mark Crusaders how she got her cutie mark in The Cutie Mark Chronicles. She says that when she was a filly, she studied magic on her own and wanted to attend Princess Celestia's School for Gifted Unicorns. At the entrance exam, Twilight was told to use magic to hatch Spike's egg, but her magic got out of control when she was startled by Rainbow Dash's sonic rainboom. Princess Celestia took note of her magical abilities and made Twilight her personal protégé. In Magical Mystery Cure, Twilight Sparkle completes an unfinished magic spell with her deep understanding of friendship. Princess Celestia tells her that Twilight is ready for the next stage of her life, and she is transformed into an Alicorn and crowned a princess.
Princess Twilight Sparkle becomes the ruler of the Friendship Rainbow Kingdom in the season four episode Twilight's Kingdom - Part 2.
Love of books
In Friendship is Magic, part 1, Twinkleshine says Twilight is more interested in books than friends. Even after Twilight becomes good friends with the rest of the main characters, she continues to read and consult books. For example, she confidently joins a marathon after reading several books about running in Fall Weather Friends.
Twilight tries to be rational in unfamiliar situations. During the investigation in MMMystery on the Friendship Express, Twilight tells Pinkie Pie to stop making wild accusations, and they work together to find clues and solve the mystery. However, Twilight can be illogical in stressful situations. In Swarm of the Century, she hysterically suggests building a replica of Ponyville in less than a minute before Princess Celestia can see the parasprite infestation.
Twilight tends to be skeptical of unproven claims, such as her friends' belief that Zecora is an evil enchantress in Bridle Gossip, and Pinkie's "Pinkie Sense" in Feeling Pinkie Keen.
Knack for organization
Twilight shows her knack for organization in Winter Wrap Up. When the Winter Wrap Up becomes inefficient and uncoordinated, she organizes the teams and ensures that winter is wrapped up on time. Mayor Mare gives Twilight the official title of "All-Team Organizer".
For the first three seasons of the show, Twilight possesses a crown containing the element of magic. She receives it in Friendship is Magic, part 2 upon defeating Nightmare Moon. The crown is studded with sapphires and a magenta star-shaped gem shaped like like Twilight's cutie mark.
After Twilight becomes a princess in Magical Mystery Cure, she receives a different crown with the element of magic embedded in it. It is a lighter shade of gold, no longer has sapphires, and rests horizontally, not vertically, on Twilight's head.
Twilight relinquishes her crown when she and her friends restore the Elements of Harmony to the Tree of Harmony in Princess Twilight Sparkle - Part 2. At the Summer Sun Celebration, she wears a new crown, which has the same shade of gold just like and looks completely different from her element of magic crown. It has more of a "classic" crown shape, with each point studded with a small magenta jewel.
Parents Twilight's parents first appear in The Cutie Mark Chronicles. In a flashback, they excitedly nod their approval when Princess Celestia offers to make Twilight her apprentice. In A Canterlot Wedding - Part 2, they attend Shining Armor's wedding and are moved to tears. They attend Twilight's coronation in Magical Mystery Cure. Twilight Sparkle's mother resembles the notable G1 pony Twilight, also known as Galaxy in the original My Little Pony television series. Twilight Sparkle's father resembles the G1 pony named Nightlight, but gender-swapped.
Shining Armor Twilight reveals that she has an older brother, Shining Armor, in A Canterlot Wedding - Part 1. She sings B.B.B.F.F. (Big Brother Best Friend Forever), a song about their close bond and how much she misses him after she moves to Ponyville. Shining Armor, though extremely busy with his duties around the Crystal Empire, still has time for his little sister, whom he calls "Twily".
Princess Cadance Twilight reveals that Princess Cadance was her foal-sitter when she was a filly. At the end of A Canterlot Wedding - Part 2, Twilight becomes Cadance's sister-in-law when she marries Shining Armor. Twilight enjoys spending time with Cadance as seen in Three's a Crowd when Cadance comes to visit her.
In the episode Twilight Time, Twilight takes time each week to teach the Cutie Mark Crusaders various skills. She attempts to teach Sweetie Belle to use the telekinetic component of her magic, Apple Bloom how to make botanic growth potions and Scootaloo how to strip and reassemble various types of scooter and cycle. She is also initially overjoyed when she thinks that all their classmates also want to learn new things and is very disappointed when she finds out that they merely want to spend time around a local celebrity. Twilight's ability as a teacher is proven in that she succeeds in teaching all three Crusaders the skills she intended to teach them. They all demonstrate a high degree of aptitude at the end of their lessons.
Twilight attempts to teach Rainbow Dash the history of the Wonderbolts, but her methods of study prove futile as Rainbow Dash acts as a class clown in Testing, Testing, 1, 2, 3.