In the first story, Twilight's Spark, Starlight Glimmer's adventure beyond the Magic Mirror prompts Princess Twilight Sparkle to develop an alternative means of interplanar travel, in the hopes of preventing further leakage of Equestrian magic into the human world. Her research inadvertently leads her to discovering a truth that has remained hidden from her for nearly her entire life: that the "spark" that awakened the Element of Magic is far more than it seems, and that Twilight herself is a planeswalker.
The second entry in the series, Shattered Sunset, follows Sunset Shimmer as she discovers the nature of her own planeswalker spark. Upon arriving in a world where the cycle of day and night transforms the soul, Sunset Shimmer's identity is split in two, leaving Equestria to deal with her greatest enemy: herself.
The third entry, Glimmering Oil, follows Sunset's return to the human world as she finds the entirety of Canterlot City transformed into a grotesque parody of its former self. Led by the human counterpart to Starlight Glimmer, the forces of Phyrexia loom omnipresent over all, and Sunset must work with her six closest friends to save everything that they hold dear.
In addition to the main series entries above, there also exist various other spinoff stories set within the same continuity:
- Sideboard Stories, an anthology of short stories set during the six months that occur between Twilight's Spark and Shattered Sunset.
- Chromatic Chronomancy, a short crossover with The Oversaturated World.
My Little Planeswalker provides examples of:
- And This Is for...: In chapter 5 of Glimmering Oil, Twilight screams that her attack is for Timber Spruce before she swings a giant magical hard-light axe into Gaea's head.
- Arc Villain: Sunset the Exiled, Sunset Shimmer's Enemy Without, is this for Shattered Sunset, while Starlight Glimmer's human counterpart is this for Glimmering Oil.
- Bare-Handed Blade Block: In chapter 5 of Gimmering Oil. Gaea Everfree No Sells Twilight's attempt to cut off her head with a giant axe woven from magical hard-light by catching it between her palms.
- Big Bad: Nicol Bolas. He's ultimately the one pulling the strings behind the Phyrexian invasion of Anthropia, and is responsible both directly and indirectly for all of the conflicts from Shattered Sunset onwards.
- Big Good: Time Turner, an ancient, powerful, and eccentric planeswalker who is just slightly older than Princess Celestia herself, and was personally mentored by Teferi. While he doesn't usually involve himself directly in the series' main conflicts, he does show up periodically to offer advice and guidance to the heroes. It's implied that he's doing something important behind the scenes, but it's never exactly clear what that is.
- On an even greater scale, Harmony is this.
- Bi the Way: During a brief look into (an admittedly drunk) Chandra's perspective in Twilight's Spark, she admist to being attracted to "every planeswalker except Jace."
- Body Horror: Anthropia, the Equestria Girls plane, is invaded by the Phyrexians. Naturally, they begin transforming its native life into grotesque, mutilated, cyborg horrors.
- Broken Pedestal: Downplayed. Twilight is clearly upset by the revelation that Celestia kept her true nature as a planeswalker hidden from her, but she ultimately continues to hold her mentor in high regard. By the end of Twilight's Spark, the two reconcile with each other easily.
- Sunset Shimmer has a much worse version of this after merging with her Enemy Without, and realizing she was right about how much Celestia hurt them both. While she still loves Princess Celestia deeply, it's clear that she came out of being turned away by her mentor with significant trauma, to the point where she flinches away from Celestia's first attempt to show any physical affection. Celestia is thankfully understanding, but it's clear that Sunset simply isn't ready to return to her side and will likely never see her in the same way again.
- Darker and Edgier: Glimmering Oil is much bleaker than the previous stories, since it involves the Equestria Girls plane being invaded by the Phyrexians. Then there's The Reveal that not only is Gaea Everfree real, she's killed Timber Spruce and Gloriosa Daisy.
- Die or Fly: Every single one of the Humane Six have gained new magic abilities following the Phyrexian invasion in Glimmering Oil, but only after suffering a near-death experience at the hands of the Phyrexians.
- It's repeatedly suggested that Sunset herself would have a similar "awakening" in the same circumstance, but she's not willing to go through with the risk of being almost killed.
- Enemy Within: Sunset the Exiled, the personification of Sunset's repressed rage and egotism, is this to Sunset Shimmer as a whole. Later she becomes an Enemy Without.
- Gaia's Vengeance: In Glimmering Oil, the true Gaea Everfree is understandably pissed that the Phyrexian contagion has threatened her forest.
- Killed Off for Real: Timber Spruce and Gloriosa Daisy were killed off by the true Gaea Everfree after the Phyrexians arrived and spread their corruptive glistening oil on her world. Sunset and the HuMane Six discover their corpses in chapter 3, before Gaea manifests herself.
- Magic Feather: Celestia explains that Twilight's Planar Amulet isn't actually what grants her the ability to travel between planes, and that her true planeswalking ability has existed within her since the day she obtained her cutie mark. That said, the Planar Amulet still does still protect its wearer from the Blind Eternities' chaotic energies, so it's not completely without a power of its own. This comes back to bite Anthropia when the New Phyrexians find it.
- New Powers as the Plot Demands: In addition to their geode powers, each of the HuMane Six gain new abilities as a result of their "awakenings," as described above.
- No-Sell: Gaea Everfree manages to effortlessly shrug off every single attack thrown at her. At least until Sunset learns she can channel her magic through Twilight.
- Real After All: The true Gaea Everfree in Glimmering Oil.
- Ship Tease: Applejack/Rarity and Sunset/Twilight are both teased at various points in the stories. Especially as Timber Spruce, HuMane Twilight's canonical crush, is revealed to have been killed off.
- Lyra and Bon-Bon are, as usual, implied to be a couple.
- Starlight Glimmer and Trixie are less "implied to be a couple" and more "an unspoken yet explicit couple", as Twilight accidentally interrupts them when they're making out in the throne room.
- In Glimmering Oil, it's revealed that HuMane Rainbow Dash has a crush on her world's Fluttershy.
- Shout-Out: Numerous.
Ditzy: What in the world!?
- Twilight Sparkle's planeswalker origin story is extremely similar to Jace Beleren's: she unknowingly became a planeswalker after her spark's ignition briefly dipped her into the Blind Eternities, which her mentor kept hidden from her throughout her entire tutelage. Thankfully, Celestia turned out to be far less of a manipulative jerk than Alhammarret.
- In one chapter of Twilight's Spark, Twilight is shown to know several Dungeons & Dragons spells by name. The chapter title is even called "Legends and Libraries," and the chapter's card is an MtG version of the D&D spell legend lore.
- Time Turner remarks to Ditzy Doo that there's probably at least one alternate timeline where she's a planeswalker instead of him.
- When Time Turner uses a time stop spell, Ditzy's immediate reaction evokes the stand of another famous time-stopper.
Twilight: Hold on, you dont actually expect me to believe you have eleven doctorates, do you? Thats ridiculous. Its not even funny!note
- When Time Turner casually boasts about his doctoral degrees:
Twilight: Several months ago, shortly after Starlight Glimmer came to your world, I conducted some preliminary research on the Mirrors impact on Anthropia. Id discovered that forcing the mirror open more than it was originally intended to had caused magic to leak through it, like a permanent planar gateway for mana. If left unchecked, I feared that the Mirror would cause your world to become... well, the best word I can think of would be oversaturated, but its a little bit more complicated than that.
- In Shattered Sunset, when Twilight writes to explain her absence to Sunset, and her rationale for researching alternative means of traveling to the human world (a.k.a. Anthropia):
- Split-Personality Merge: When the two halves of Sunset Shimmer reconcile with each other at the end of Shattered Sunset, they both merge back together into a single being. Sunset also gets a fancy new pair of wings out of it, too.
- They Call Me Mister Tibbs: Doctor Time Turner would very much like you to remember his doctoral degrees and address him appropriately, thank you very much.
- "The Reason You Suck" Speech: Sunset's Enemy Without delivers one to her, one that also doubles as a Motive Rant:Sunset the Exiled: Ever since we became separate at the Fall Formal, youve been saddling me with all of your emotional baggage just so you wouldnt have to deal with it yourself! But we didnt have to stay separate! I could have known what it was like to feel love, or joy, or compassion, or empathy, if only you just let me in! Instead, Ive never known anything but anger and resentment and... and spite, because thats the only thing youve ever allowed me to feel!
Sunset the Redeemed: I... What?
Sunset the Exiled: Do you have any idea any idea just how much pain and resentment Ive been having to deal with while you were out frolicking with your friends? I had to be the one to remember how Celestia turned us away, and left us all alone in a world we didnt even know how to survive in! I had to be the one to remember all of the times we nearly froze to death sleeping outside in the slums! How many times we had to go hungry because we were too young to find work, and too unimportant for anyone else to care! I had to be the one to remember how Twilight robbed us of any chance we had left of returning and becoming Celestias student again, how she replaced us in the eyes of the only family weve ever had! I had to be the one to remember how she stumbled upon her wings by accident, when wed worked so hard just to be good enough to earn Celestias attention in the first place! Because instead of learning to cope with any of these feelings, you passed them onto me, and then kept me imprisoned in the back of your mind so you could pretend I didnt even exist! How was I supposed to feel about that, huh!?
- Time Master: Time Turner, natch.
- Unwitting Instigator of Doom: Poor Twilight manages to do this twice. The first is when she loses the Planar Amulet in the Blind Eternities, where eventually winds up in New Phyrexia, allowing them Phyrexians to successfully develop interplanar travel technology. The second time is when her presence on Ravnica attracts the attention of Ral Zarek, through which Nicol Bolas learns of Ungula and sets the plane within his sights.
- Chekhov's Gun: In part one of the Golden Sun's Zenith chapter of Sideboard Stories, Celestia leaves to establish diplomatic contact with a nation on the other side of the world. As she leaves Luna to take care of raising the sun while she's away, Celestia also teaches her a spell that will instantly teleport her to Luna's location, no matter where she is. In part four of Golden Sun's Zenith, Luna uses the spell, allowing Celestia to escape her imprisonment.
- Friendly Neighborhood Vampire: Rarity is revealed to be this in one Sideboard Stories chapter.
- Sealed Evil in a Can: The ancient, demonic planeswalker Arzakon, revealed to be the true force behind the Pony of Shadows in Shadows over Equestria chapter of Sideboard Stories.
- Also the ultimate fate of Ahuizotl, who is imprisoned within the sun by the titular artifact of Golden Sun's Zenith.
- Willfully Weak: It becomes apparent that Princess Celestia is this in Golden Sun's Zenith, upon being captured by the Cuetzpali Empire. While she could blast her way out of her restraints, to do so would not only create excessive collateral damage, but also destroy whatever slim chance of diplomacy exists between Equestria and a much more militarily powerful nation.