The rather... self-centered student and protégé of Celestia, as well as an obsessive fanficcer who has very lofty ambitions when it comes to becoming a princess and is in love with hernot-blood-related older brother Francis. Like the rest of the Mane Six, she abuses Spike on a daily basis. As of "Lunar Slander", she now has Luna/Molestia's title as princess of the night, and as of "Foaly Matripony", she is now married to Francis.
Enfant Terrible: According to the flashback of her foalhood in her song in "Foaly Matripony", she killed two foals who were competing with her in academic talent.
Everything's Better with Princesses: In "Dragone Baby Gone", she claims that Celestia has named her a princess along with being the leader of Team D.E.S.U. And as of "Lunar Slander" Luna gave her title to Twilight Sparkle.
Applejack: With just a little teamwork we can all- Twilight: I'm going in alone!
Literal-Minded: Twilight thinks Princess Celestia wants her to build a "book fort." At the end of the episode we find out the princess had told her that "books are your forte".
Twilight: Fort... e?
Love Makes You Evil: Her love for her adoptive brother Francis drives her to vaporize the competition in her younger days, then trap and kill off his fiance and brainwash him into loving her back.
Manipulative Bastard: Twilight Sparkle plays Molestia like a harp from Hell in Lunar Slander, and is all but confirmed to have been the one who convinced Celestia to banish her to Space Camp in the first place. Her apparent success in convincing Molestia to abdicate might push her into full fledged Magnificent Bastard territory.
Noodle Incident: Maintains that her attempt to make waffles in a bounce house would've worked if not for Spike's weak grip, but Celestia forbidding her to enter a bounce house ever again says otherwise.
Not So Harmless Villain Protagonist: At first, she seems to be a simple incompetent jerk. It turns out she is a completely unhinged, surprisingly manipulative, possibly incredibly powerful incompetent jerk.
Psychopathic Marechild: Type B. Twilight has the empathy and worldview of an incredibly spoiled little girl, and isn't all that much smarter than one. Her magical aptitude, ruthlessness, and occasional bursts of cunning are what make her so dangerous.
Self-Serving Memory: In "The Perfect Swarm", her recollection of the scene with Spike from the beginning of the episode.
Spike: (actual scene) But your blueprint is just a crude sketch and a bad pun!
Spike: (flashback) I'm too dumb and fat! And your blueprint is just a great sketch and a clever pun!
Shipper on Deck: Literally. She wrote an entire 70-chapter shipfic about "Applesack" and "Charity".
Start of Darkness: Covered in a flashback song in 'Foaly Matripony'. Seems she was always something of a loon, but when her brother (i.e. the focus of her obsession) left home, she threw herself into studying magic in a bid to control everyone around her. And her efforts paid off...
Straw Fan: She's a caricature of a stereotypical anime fan, being a scatterbrained Japanophile with a viciously manipulative streak.
Yuri Fan: Writes a yuri fanfiction starring Rarity and Applejack, and forces them to act it out.
"She said I was forbidden to dream!"
Twilight's assistant and the resident Butt Monkey of the cast. Literally everypony hates him, from thinking of mean things to say about/do to him to giving him difficult tasks such as holding a lightning rod on top of Twilight's library during a thunderstorm.
Amusing Injuries: Constantly getting hurt. It's usually offscreen, but it's always played for laughs.
Hollywood Tourette's: Averted. Spike's Tourette's doesn't cause obligatory swearing, but it does cause him to involuntarily teleport his epic fantasy trilogy to Celestia... who destroys his years of work, thinking it's another one of Twilight's creepy fics.
Interspecies Romance: His crush on Rarity, though it makes sense here as we learn that dragon-pony relationships have happened before, there have been offspring, and we've already met at least one. Evidently dragon genes are entirely recessive.
Applejack: Apple Bloom, the grapes are different than our kind! You know what that means! Apple Bloom:(cheerfully stomping grapes) Destroy! Destroy! Destroy!
Heroic Sacrifice: Attempts to do this in "Cherry Bomb" by taking the bomb out of town and sparing her friends from a fiery death, but they catch up with her anyway. Raincloud then saves them all by flying away with the bomb before it explodes.
Only Sane Mare: Is this in "Cherry Bomb," where she does her best to warn her friends about the bomb, but all her attempts fail, causing her to resort to desperate measures. Said desperate measures are of her letting them witness her horrible demise by the bomb just to get them to believe her about it.
Parental Abandonment: Her parents died six years ago while on vacation. They come back via one of Pinkie's portals, and then decide to take another vacation without their daughters. And die again, if the offscreen crash sounds are any indication.
Pet the Dog: She missed the eclipse and the attempted return of the Smooze in order to attend the Sentient Social with Sweetie Belle. Even her reasoning for doing so is a little heartwarming. "I wanted to save your soul". She cared enough for Sweetie Belle that she wanted to make sure she got through the apocalypse, when it did arrive.
Cute Is Evil: She's soft-spoken and adorable, as well as the half-dragon leader of a doomsday cult.
Devil in Plain Sight: It's pretty ridiculous how the other ponies regard Fluttershy when she called the parasprite swarm her "Army of Darkness", killed at least 13 dragons and many other demons, enjoys clubbing Spike with her spiked club, throws rabbits into bonfires, and leads a Religion of Evil.
Dissonant Serenity: She almost always speaks in a calm and soft voice, even when talking about such things as her "Army of Darkness" turning against her.
Villainous Crush: Implied to have one on Pinkie. The Establishing Character Moment of both her and the series in general is of her singing "Hellfire", which is about an evil religious leader's obsessive lust for a gypsy. Fluttershy leads a Religion of Evil and Pinkie is constantly called a gypsy witch. And according to Apple Bloom, Fluttershy said Pinkie has the "voluminous hair of a temptress."
"I have incredible peripherals!"
A self-absorbed ditz who often speaks by using her own name alone and has terrible eyesight (to the point that she wasn't allowed to join the army during the war because of it). And if Scootaloo's word is anything to go by, Rainbow Dash is Scootaloo's mother as well.
Abusive Parents: Scootaloo claims that Rainbow Dash is her mother. Said mother never even acknowledges her daughter's existence, though that might be a combination of her astigmatism and idiocy.
Blind Without 'Em: She admits that her astigmatism made her too nearsighted to join the army during the war or the Wonderballs now. Everything's blurry from her viewpoint. She mistakes Apple Bloom for Applejack at first, and then later both Diamond Tiara and Silver Spoon. She refuses to listen to her eye doctor about getting glasses, though.
Rainbow Dash: I always liked rainbows and all, but I was dashing nowhere in a dash. It wasn't until my very first dash that I rainbowed a rainbow need to dash. And rainbow! Dash rainbow dash rain dash rainbow rain dash dash!
An orphan gypsy whose parents died long ago, leaving her to be raised in a loveless orphanage. She's also believed by everypony to be an evil witch, and is somehow the closest thing to an Only Sane Mare in the entire cast.
By "Cute from the Hip", she's actually learned gypsy magic from Zecora.
Orphanage Of Emotional Abuse: Judging from her orphanage songs, she was taught that she probably wouldn't ever be adopted because she was an 'ugly pink earth pony' and wasn't special enough to be loved. Her song in "Cherry Bomb" also reveals that they taught her to hide what did make her special.
Parental Abandonment: Most of her character revolves around being orphaned following her parents' untimely deaths.
The Quiet One: According to Celestia, almost all of Pinkie's dialogue in "Foaly Matripony" was cut for time.
Stepford Smiler: Sweet Celestia, yes. For all her happy-sounding songs and cheerfulness, she's incredibly miserable deep down. May not be the case anymore after resurrecting her parents.
Do Androids Dream?: Even though everypony accepts that robots don't have souls, Sweetie Belle is one of the few characters to demonstrate love or empathy, or to call the others out on their Comedic Sociopathy.
The trope namer is directly referenced as well - when Sweetie Belle sees sheep, she mentions seeing them in her dreams.
Dramatic Irony: Sweetie Belle accuses Rarity of being a "soulless automaton" when she protests attending the Sentient Social with her. Of course, she's also (quite obviously) a robot herself, but nobody (including herself) notices.
Ambiguously Jewish: She's this, not because of surname nor mannerisms, but because of her "mark mitzvah" celebration upon getting a cutie mark. It's only really ambiguous because the finer points of pony religions are unaddressed. According to Silver Spoon Escapes From Camp Energy, her human counterpart is.
Companion Cube: She gets a gift box, and declares it her new best friend. While Silver Spoon is right next to her.
In the same episode...
[Snails takes a massive bite out of a cake with a smiley face drawn on it. The cake frowns.] Diamond Tiara: Hey! Cakey is my best friend! I get to decide when she dies!
Loving Bully: "My cruelty is supposed to make you like me more, not drive you away!"
Apple Bloom's cousin, who comes to visit and joins Diamond Tiara and Silver Spoon in tormenting the Snooty Snark Evaders. In the end of "Seed No Evil", she goes blind after they wish upon Twinkle and invoke powerful dark magic.
Heel-Face Turn: Defied. She explicitly states that even though she's now blind, she'll continue to pick on others.
Prophet Eyes: Gets these after she's blinded. She seems to enjoy how uncomfortable they make people feel.
Third Wheel: Becomes this to Diamond Tiara and Silver Spoon.
Scootaloo: Now they have an orange one!
An actual Raincloud,and the leader of the Ponyville Rescue Squad. Dies saving Applejack, Fluttershy, Rainbow Dash, and Twilight from a bomb.explanation Based on the rain cloud that Derpy was jumping on in "The Last Roundup"; this is played on in "Cherry Bomb" by recreating the Derpy scenes from "The Last Roundup" sans Derpy (Rainbow effectively talking to herself.)
Fantastic Racism: Despite being a helpful worker and delivering mail, she will never be seen as one of the ponies.
Heroic Sacrifice: In "Cherry Bomb", Raincloud saves Applejack, Fluttershy, Rainbow Dash, and Twilight by taking the bomb that Applejack had been carrying and flying away with it, just before it explodes. Of course none of the Mane 6 seem to notice.
Parental Abandonment: If you pause it in the right spot, you can see Raincloud speeding away after dropping Francis on Twilight's doorstep.
The Silent Bob: Is somehow able to carry on a conversation with Rainbow Dash, in spite of being completely silent and expressionless.
Ruler of Equestria and Twilight's mentor. She doesn't seem exactly fond of her student, but Twilight either is oblivious to it or ignores it.
Ambiguously Evil: She's never actually done anything particularly heinous onscreen, but she is at the very least the apparent head of a racist police state.
Characterization Marches On: In the first episode, she seems to actually like Twilight Sparkle — albeit in more of a "writer and Big Name Fan" way than their close relationship in the actual show — and actually asks her for a friendship report. Later episodes show Princess Celestia to consider Twilight obnoxious at best and creepy at worst, and establishes the letters as something Twilight took it upon herself to send and Celestia wishes would just stop — she used to find it endearing when Twilight wrote her letters about her lessons when she was a filly, but now Twilight is doing things like sending her a massive shipfic about two of her friends.
Meaningful Name: The "ce" part of Celestia is derived from the sound of "sun", according to the prologue of "Lunar Slander."
Only Sane Mare: Possibly. She is seemingly the only person in the cast who is appropriately cautious about Twilight's dark side: "Foaly Matripony" established that she exiled Twilight from Canterlot for killing two of her classmates and tells her that she wants to see "as little of her as possible" when she's allowed back in for the royal wedding. Sadly, she wasn't sane enough to figure out that Twilight had imprisoned Cadence and left her for dead.
Celestia's sister, the Adorkable princess of the night who assumed the name of "Luna" at Space Camp. As of "Lunar Slander", she has given her title as Princess to Twilight Sparkle.
Adorkable: Albeit in a more conventional fashion (accent notwithstanding) than her canonical counterpart.
Together, we shall do friend activities such as... puzzles, and... hugging, and... OTHER THINGS!
Ambiguous Disorder: She has issues with personal space, social situations, and the volume of her voice. She's not avoided for being scary, as she thinks, but because she's awkward and clingy.
Francis Sparkle's fiancée. She's a world peace advocate, charity worker, wildlife conservationist, organ donor, children's book author, and the freely elected ruler of her own country. She doesn't marry Francis. Twilight instead imprisoned her in a cave, where she died.