Twilight Sparkle (Rue Day)

Twilight Sparkle, mostly referred to as Twilight or Princess Twilight, is the deuteragonist in The Magic of Rue Day. She is Shining Armor and Greenie Bean's younger sister, Twilight Velvet's and Night Light's the daughter,  Rue's godmother/maternal aunt/guardian, and Flurry Heart's paternal aunt and Discord's and Cadence's young sister-in-law.

Cutie Mark
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 Celestia's School for Gifted Unicorns. At the entrance exam, Twilight was told to use magic to hatch Spike's egg, but she was unable to cast a spell. A moment after she gave up, Rainbow Dash's sonic rainboom startled her and caused her magic to go out of control. Princess Celestia witnessed Twilight's magical abilities and made Twilight her personal protégé.

Personality
Twilight in the series' premiere used to be anti-social and kind of a loner, despite the fact her unicorn friends wanted to hang out with her.

Pinkie Pie
Twilight first meets Pinkie Pie when she first comes to Ponyville, however, instead of saying "Hello", Pinkie rushes off, confusing both Twilight and Rue Day, and Spike as well. However, secretly, Pinkie wasn't shy. She just went over to arrange a party welcoming Twilight to the Neighborhood at the Golden Oak Library.