There are 7 immortal rulers of Equestria...
The Princesses of Harmony, Twilight Sparkle, monitors harmony in Equestria and raises the Sun, and Starlight Glimmer, monitors the disharmony in Equestria and raises the moon;
The Crystal Princesses, the Princess of Love, Mi Amore Cadenza aka Cadence, and her daughter Flurry Heart, also known as the Winter Princess or the Princess of Life; 
The Crystal Duke, Prince Sombra, also known as the Winter Prince or the Prince/Duke of Death;
Discord, the Lord of Chaos;
and Fluttershy, also known as Mother Nature (Discord transformed Fluttershy into a Dragonequus, an immortal chimera, not only because he couldn't bear the thought of her dying, but to also disrupt Harmony (instead of an even number of rulers, it is now odd)).

Twilight Sparkle and Starlight Glimmer opened up a school that was available for every creature in Equestria, Glimmer-Sparkle School of Harmony, or GSS (which was originally titled Sparkle's School of Friendship until Starlight's alicorn transformation).
A similar school was opened in the human dimension, founded by Sunset Shimmer and Sci-Twi, known as Shimmer-Sparkle University, or SSU, which, similar to GSS, teaches its students about the importance of the 6 Elements of Harmony and/or the history of Equestria.
Ironically, the GSS and SSU school mascots are a heraldry style silhouette of (my) Discord (redesign). A little excerpt in a fake journal I wrote recently says "Chaos is what made everypony unique. Discord's powers helped restore Harmony. However, he's still a malicious chimera who's nearly unstoppable. Expelling Discord into Limbo temporarily until Harmony begins to falter was necessary."
Basically they chose Discord as their mascot to show appreciation for his contributions to Harmony.




Interesting, right?  Some things have noticeably been altered such as Twilight's princess role or her school's name if you couldn't tell.
You may also have noticed "(my) Discord (redesign)." That's right, I'm redesigning all the characters I've listed (except for Sunset and Sci-Twi)  I want Twilight to look more like a Sun princess and Starlight like a Moon princess. Discord and Sombra will look more pleasing to the eye, and Cadence and Flurry will look more like mother and daughter.  Hooray! Let me know what y'all think so far