Pretty Cure Mirai ~ Spark! is a Pretty Curefanseries by Caits Meow.Hiroko Tsubasa arrives at Mirai Academy hoping to find a sense of purpose. On her first day, she meets a variety of people, including the tomboyish gymnast Izumi, the Headmistress' stoic daughter Yasu, and the excitable Jun, who is actually Muse, an emissary from the Hallowed Wellspring. Muse informs Hiroko that she, along with two others with high levels of "Spark Energy", was chosen to become a Pretty Cure, one of the city's guardians. When a monster attacks the campus, Hiroko takes on this duty; soon afterward, Izumi and Yasu also become Cures.The newly-formed Cure trio must thwart the plans of the corrupt Devil King Aseimera, who seeks to tear down a barrier between the world of demons and Earth, with potentially cataclysmic results, by sending his servants to destroy the barrier's energy and target Pretty Cure's predecessors. Two more teammates eventually join their group: Muse herself and Haruki, Yasu's younger brother.
Anticlimactic Sibling: Hiroko spends a bit of episode 8 worrying about Chiaki's visit to Kyukai, convinced that her teammates will abandon her in favor of her more talented older sister as soon as they meet. When Chiaki actually shows up, nothing of the sort actually happens, and everyone spends a fairly ordinary (off-screen) afternoon together.
Arbitrary Skepticism: In episode 11 - despite being a Magical Girl Warrior who fights Youkai-inspired enemies and answers to a talking cat and a magical mouse, Izumi refuses to believe that ghosts actually exist. She hits the roof after finding out that yes, they actually are real.
Ascended Fanon: The notion that some citizens of the Devil Kingdom are transformed humans was first posited (albeit in a slightly different form) on a forum thread by a reader. The author liked the idea so much that she decided to work it in, and it does become a backstory point for one of the characters.
Big Sister Bully: Hiroko's sister Chiaki is implied to have been a milder version of this. Hiroko doesn't seem to resent her too much for it, though. Kimiko was an Older Cousin Bully towards Shun when they were kids. She's mellowed out a lot over the years, but she still likes teasing Shun.
Custom Uniform: Unlike most Mirari students, who wear parochial uniforms, the Fukuda siblings wear pristine miltary-style uniforms, much like Ohtori's student council in order to signify their status. According to Yui, they're partially a holdover from Mirai's previous uniforms, which were all military-style.
Debut Queue: Played straight with the introduction of the Cures, swapped around with the early-season upgrades - Yasu, introduced third, gets hers first, then Hiroko, then Izumi.
Dramatic Irony: During episode 9, Kae mentions that she wants to hire (read: kidnap and brainwash) a human to replace Tobi in the Trio, with two caveats - the replacement has to be male, and he can't be anyone important to Pretty Cure. She ends up targeting ShunSiegel. Whoops.
Dramatically Missing The Point: Marina tells Pretty Cure that one earns their Cure Arms by overcoming a weak point - Yasu accepted that she's allowed to have emotions, Hiroko realized that she had to be strong for herself, not because she wanted to outdo Chiaki. Izumi decides that "overcome your weak point" means "train harder". Her stubbornness means that her Cure Arms doesn't appear for her in episode 9, and she doesn't realize what Marina really meant until the next episode.
Feminine Women Can Cook: Girly girls Hiroko and Yasu are quite good at cooking, while the tomboyish Izumi is absolutely terrible at it, to the point of somehow managing to light instant ramen on fire. On the other hand, episode 11 reveals that Shun is quite the cook, and she's far from feminine.
Red Oni, Blue Oni: Izumi and Yasu. Shun is both - she's the Red Oni to Kimi's Blue but the Blue Oni to Izumi's Red.
Sensitive Guy and Manly Man: Out of the two named members of the kendo club, Haruki is the sensitive one, and Shouji's manlier. Tobi and Kooyoo are a villainous version of this.
Tomboy and Girly Girl: The upbeat and combative Izumi is the tomboy of the team, while the more traditionally feminine Hiroko is the girly girl. Other duos of this type include Yuriko and Shiori, Shun and Kimiko, and Kae and Shahei.
Home Base: Fukuda Manor and sometimes, Hiroko's dorm room have ended up defaulting to this for Pretty Cure.
Identical Stranger: Atsuko, Kou's older sister, looks exactly like an older version of Hiroko, to the point of being almost identical in height and build. Naturally, Hiroko passes herself off as Atsuko at one point.
Ineffectual Sympathetic Villains: The Magnificent Trio. They really want to be fearsome villains but have no idea about how to actually go about it. While they do manage to cause trouble for Pretty Cure on a personal level, it's pretty much always by complete accident, and their defeats end up with one or all of them being humiliated in some manner. The Cures stop taking them seriously fairly early on, much to Kae's distress.
Insistent Terminology: Nanami is called "Madame President", not "Council President", and Kae is a fearsome criminal gang leader, thank you very much.
Non-Uniform Uniform: Izumi wears her uniform in a much more disheveled fashion, while the Student Council (yes, including Shinobu) all wear unique, color-coded neck ribbons. Shun used to wear Kyukai Public's male uniform and later dons it again when passing herself off as a high school student.
Not What It Looks Like: Nanami proposes to become Muse's big sister at the beginning of episode 6. From her body language and the way she starts her request, Kaoru assumes she's proposing something else.
Official Couple: Seimono/Kamryou is strongly implied, while Yuriko/Shiori is flat-out stated. Izumi and Shun are already showing signs of eventually becoming this.
Pink Girl, Blue Boy: Yasu wears a pink uniform and Haruki wears a blue one. Their accessories and some of their rooms' decor, including the nameplates Yasu created for their doors are also appropriately color-coded.
Red and Black and Evil All Over: Aseimera and the main Triumvirate members employ this color scheme in their attire. The Black Palace's decor is also themed this way.
Reluctant Monster: Episode 19 has Madoka, a plant-monster Dogou capable of transforming into a human boy and feeling emotions. He's created to infect the plants around Kyukai and entrap at least one of the Cures but soon decides he'd rather live like a normal human. He doesn't get the chance - he eventually reverts into a mindless monster, and Pretty Cure is forced to destroy him.
Sadistic Choice: The climax of episode 12 hinges on Hinyu forcing Marina to make one - sacrifice herself and weaken the barrier between the worlds or save herself and put Pretty Cure - and many of their classmates - in mortal danger.
Schoolgirl Lesbians: Nanami and Kaoru. Izumi and Shun would also count, if the latter hadn't recently graduated high school.
Serious Business: Izumi is very passionate about pizza. Way too passionate, in fact. Kae is also a repeat offender - apparently being a "fearsome criminal gang leader" means freaking out over trivialities like someone "stealing" your intro speech.
Kou tries to mention Lucio Fulci in episode 8 before Marina says, "Kou, the zombies can wait."
As mentioned above, three of the dresses in the Fashion Shop Fashion Show came from a Fan-Art the author requested from a friend; the author liked the resulting designs so much that she decided to incorporate them into the story somehow.
Show Within a Show: At least two - Space Team Cross-3, a Sentai anime and manga that Kae (badly) cobbles ideas from, and Chrome Detective Tetsu a (suspiciously fanservice-laden) tokusatsu series about a cyborg police detective.
Sixth Ranger: Haruki, Muse, and Shun for the initial trio, a fact that was spoiled as soon as the author first started sharing ideas for the story. Nanami invokes this during the Lower Deck Episode, temporarily allowing Kou to follow the Council along just so they'll also have five members to parallel Pretty Cure.
Spot the Impostor: Tamakushi tries catching Pretty Cure off guard during episode 4 by using her doppelgangers to impersonate their loved ones (Chiaki, Shun, and Haruki, respectively); later on, she assumes Izumi's form during episode 9 in an attempt to alienate her from the team (and steal their Puricells while she's at it). Both times, she's outed by fudging important details about the people she's imitating.
Through Their Stomachs: One of Hiroko's favored befriending techniques. This is also why Izumi decides to seemingly drop out of character and enter a cake contest - she's convinced that baking something for her parents will help them understand her feelings. Unfortunately, she's, well...
Trademark Favorite Food: Izumi loves pizza, Shouji loves soba noodles. They fight over which is better at one point. Shun is also inordinately fond of pancakes, while Kaoru enjoys donuts. Izumi also has a trademark hated food in miso, which becomes a minor plot point in one episode.
Unsettling Gender-Reveal: During his first year at Mirai, Kou gave a love confession to the council's "adorable secretary", Shinobu... who then revealed that "she" was a boy. He still gets flak about this, primarily from Shinobu himself.
Hiroko develops a crush on Shun at first sight... and immediately loses it after learning "his" actual gender. Later on, Kae forcefully "hires" Shun as a replacement henchman, remaining unaware of her actual gender until Kooyoo finally points it out. Kae decides to just ignore that piece of information, to Shun's mounting annoyance.
Unusually Uninteresting Sight: Most of the villains seem a bit... off when passing as humans. Few people in Kyukai seem to notice unless said villains are actively causing trouble.
Verbal Tic: Muse tends to end sentences with "~nya" in mascot form, and every member of the Magnificent Trio has their own personal sentence-ender. Yuriko also tags many of her sentences with "ya know?".
Villains Out Shopping: Primarily with the Magnificent Trio, who spend a good deal of their off-time hanging around Kyukai playing pachinko machines, fetching lunch, shopping, etc.
Vitriolic Best Buds: A type 1 example with Kooyoo and Tobi - the former thinks the latter is one of his "best buds", the latter usually tolerates the former at best. There are also type 2 examples with the bickering "siblings" Izumi and Shouji and loyal but argumentative cousins Kimiko and Shun.