After the End: NGE-Earth, courtesy of Second Impact in 2000. After the cataclysmic shockwaves, seismic upheavals, and megatsunamis that ravaged the globe, along with the devastating wars that followed, humanity's population was brought from six billion down to around 1.95 billion, having clawed their way back up to 2.25 billion by 2015.
Apple Bloom: "After all you've done... Breakin' foals' hearts, teasin' those you see as lesser than yerself, excludin' lonely folks, not helpin' anyone unless it benefits you... Would your mama be happy with what you've done and become?"
In Book 26, Malia Abaddia is pressured by Madoka and the three lead Cures into explaining why she values power so much, in the form of an angry Motive Rant about how her kind and loving Good Parents were murdered for "preachin' about being nice to the wrong people", and how the powerlessness she felt then led her to come to believe power was the only thing that mattered, that niceness was weakness and her parents deserved what they got for being "weak" and she thus did not mourn them, and that she'd thrown out things such as happiness, love, forgiveness, sadness, and loneliness. In response, Cure Melody delivers a knockout: "If that is true, then why are you crying?" Upon finally noticing the tears she'd been shedding throughout half of the rant, Malia panics, looking genuinely rattled and a little scared, and then bolts.
A Storm Is Coming: Said word-for-word by the mysterious cloaked girl who's been helping Teana and leaving data on her activities with certain individuals on other worlds.
In Book 23, after Majora is defeated, the four Giants use their power on Link's masks to revive Darmani, Mikau, and the Deku Butler's son; they also revive the Skull Kid, who had been killed by Majora after it was done with him.
In Book 26, during the big Edo Tensei battle, Dark Precure, having let go of her hate & anger at the end of her life and now begging her sister and the other Heartcatch Cures to help her, is hit with Heartcatch Orchestra, which somehow not only returns her to life, but purifies her of the evil darkness she had previously carried.
Shinji: (eyeing the smoldering Angel): "Anybody up for barbecue?"
Boring, but Practical: A few of the Mangekyō Sharingan's abilities discovered by Teana. Besides the flashy and eye-damaging "Big Four", the Mangekyō can also grant telescopic sight and the ability to see into the infrared and ultraviolet spectra; using these abilities also does not damage the eyes, like the primary offensive techniques of the Mangekyō do.
Broken Pedestal: Subaru used to essentially worship Nanoha. That went out the window after Nanoha's actions led to Teana leaving the planet.
Combination Attack / Combined Energy Attack: In the final battle of Book 21, Goku, Naruto, and Teana plan to take out Amon with a Spirit Bomb. Of course, since the SB by itself wouldn't be enough, they hyper-compress it, add rotation and a heap-load of Sage and Wind chakra, and smack Amon with the Mother Of All Rasenshuriken. That does the trick note ...until Narud's backup plan (the cast-off energy gathered from the Xel'Naga Artifact's firing and Kerrigan's de-Zerging) promptly resurrects Amon, albeit in a weaker state and confined to his home realm for the time being.
Book 9 adds the Arbiter's supercarrier Immortal Honor, the UNSC Infinity, and - on the villains' side - the 14-kilometer behemoth Saint's Cradlewhich ends up in the TSAB's hands by the end of the Battle of Belka, but requires close to a year of extensive repairs before it's combat-ready again; it makes its grand re-debut during the Reaper War at the head of a fleet of reinforcements, using a plethora of new weapons to bulldoze through any Reapers in its way.
Don't Make Me Take My Belt Off: In Book 26, after Ruin is defeated by Tiida after she uses Edo Tensei to cause a lot of people pain, he comments on how "behind all your dark power, your Keyblades, your viciousness, your bravado... you’re kinda just a mean, nasty, ill-tempered, ill-behaved little brat", and goes on to say how there's really only one way to deal with that kind of person. He proceeds to restrain her with his Susanoo, de-pants her, pull out a paddle and punish her to the point of "bawling and wailing like an infant" in front of quite a few people, including her nemeses Fate & Alicia. To make it worse, once he's done he drops her through a portal back to her home so that she lands butt-first, and he places a counter-spell on her backside that renders it immune to healing magic, as well as to any attempt to cool/soothe it through other magical means, so she can't take the easy way out from the post-spank pain. She takes it poorly.
Everyone Is Bi: At least, everyone in Gamma Team and quite a few out of it.
Eye Scream: In Book 7, Asa loses her left eye and is fitted with a cybernetic replacement. Also, the injury Rin suffered to his left eye as a child is addressed, is revealed to have never fully/properly healed. Book 15 sees Trixie lose her right eye to a Zergling; she almost bleeds to death because of it.
"Stay safe, little sis." (Thom, thinking of Teana)
"Teana... You've come so far. Your brother would've been so proud of you. I'll tell him you said hello. I'm thankful that I got to meet you. You were like a daughter to me. Good luck down there... and tell 'em to make it count." (Jorge)
"Come on, you sons of bitches! I've got a bullet for each of you! Before I die, I'm sending each and every one of you to Hell!!" (Jun)
Groin Attack: Noble-6 pulls this on an Elite early in Book 1. Sangheili genitalia are internal, rather than external like humans, but Spartan strength still means it hurts like a sunuvabitch.
Heroic RROD: Use up too much chakra, and your body starts to pay the price. Reduce your reserves to below 25%, and it's officially-recognized chakra exhaustion. Below 15%, tissues and organ systems begin to break down. 8%, and most people slip into a "short" coma. Zero, and you just plain die. The danger of chakra exhaustion is made abundantly clear in Book 8, when five hours of delicate medical ninjutsu purging the Hinamizawa Syndrome from Satoshi Houjou's body reduces Kaede's reserves to around 7%, very nearly killing her.
Hope Spot: In Book 5, Chapter 27 - The Lifemaker's been exorcised, freeing Nagi. Everyone's alive and mostly unahrmed. ...Then the Lifemaker manifests a physical form independent of a host, kills Chao, and sucks the entire planet into the Eternal Garden.
Human Subspecies: So far we've got four extant subspecies of humans: Homo sapiens sapiens (baseline modern humans), Homo sapiens sanguinus (the Lucavi), Homo sapiens diclonius (the Diclonii), and Homo sapiens saiyajin (the Saiyans). We also have Homo longevinus, the Elvaan, who are genetically a different species from humans, but still of the same genus.
It's All My Fault/My God, What Have I Done?: In Book 5, Teana has this reaction when it comes out that her plan to hook Mundus Magicus up to The Ark to avoid having to sacrifice Asuna created a resonance within the Solar System's background magical energy that weakened the Lifemaker's seal, allowing him to break free.
Also, Rin blames himself for the nasty fight between Asa and Kaede. Teana agrees.
In Book 8, Teana blames herself rather harshly for Kaede nearly dying of chakra exhaustion, beating herself up over not taking the possibility into account. However, a medical shinobi and Shamal both absolve her of blame; as a healer, it is Kaede's responsibility to monitor her own chakra levels while on the job to prevent such a thing from happening, and her failure to do so was her own mistake.
Marshmallow Hell/Funbag Airbag: In Book 1.5, a spar between Teana and Ahsoka leads to a wayward Force Push knocking Shion onto Marie, with the latter's face ending up wedged between the former's boobs.
Marie: Huh. They are bigger than Sarah's...
In Book 11, Yuka and Arakawa do this to Kanba. From front & back, at the same time. While pretty much naked.
Oh My Gods!: Teana invokes the Saint Kaiser more than once, and some of the shinobi invoke the Six-Paths Sage. Thanks to being trained by the Dark Templar, Shion has used "By the Void" at least once. And the Equestrians often swear by Celestia or by her father Ouranos.
Setsuna: "Daemons are what demons quake in fear of. Demons aren't all bad, and some are borderline heroic. Daemons are ruthless monsters that care for naught but death and destruction. Also, daemons completely outstrip demons in terms of power. There are four types of demons & daemons. Lesser demons are the type that Mana-san and I can mow down by the dozens for the weaker ones, and maybe the stronger lesser demons we can deal with without exhausting ourselves. Greater demons are bigger and stronger, but still nothing an S-rank or higher can't handle; that huge kishin that Amagasaki used Ojō-sama to summon back in Kyoto was a high-end greater demon. Daemons are far different... and far worse. How many of you know of Warhammer 40,000? You know how the monsters of Chaos are called "daemons"? Most aren't really; they're far too weak. Most Chaos "daemons" are more along the lines of Mid- or Greater-Demons in power, and their "Daemon Princes" are at the absolute lowest end of Lesser Daemon power. Greater Daemons, also called Daemon Lords, are essentially gods in power. The four Chaos 'Gods' would be more accurately classed as true Greater Daemons."
Shoot The Grenade: In the first Delta Halo chapter of Book 1: "There was one memorable moment where the Scorpion's cannon hit an active/tossed plasma grenade that was in midair, leaving the Grunt who threw it too dumbfounded by the odds of what he'd just witnessed to avoid getting ripped apart by the Scorpion's MG turret."
Space Pirates: Book 12 introduces the Black Suns, a violent and well-armed pirate/crime syndicate that's been a thorn in the UNSC's side for over 170 years.
Washington: "They're the oldest operating "extra-legal" group; they were founded in 2378. They're a large and powerful crime syndicate who have their hands in all sorts of dirty business – narcotics trafficking, slavery, illegal mining, piracy, corruption of government officials, cyber-attacks, even high-profile theft of UNSC property now & then, not to mention scavenging off battlefields left behind by other factions' fights. They've also worked as hired guns for the Insurrection, performing terror ops and harassing UNSC cargo ships."
Starship Rescue: In Book 9: things are looking bad, a droid warship is flying toward the TSAB Army HQ spire, ready to blast it... and gets blasted from above by the Arbiter's supercarrier, which has brought a hundred and thirty allied ships to save the TSAB's collective asses.
Book 18 has the Normandy II swooping in to blast a horde of Demons and Unversed that were pressing in on a DDF team.
The Atoner: Every single member of the Sangheili Alliance.
The Cavalry: In Chapter 2 of Book 9, Gamma Team shows up on Midchilda just in time to push back a Gadget Drone assault on the capital.
The Corruption: Comes in four stages. At stage 1, the irises of your eyes turn golden-yellow. At stage 2, the sclera of your eyes turn black. Stage 3 and your hair turns an unnatural silvery-white. Reach Stage 4, which is complete/terminal corruption, and you lose your mind & your humanity and become something else.
The Great Offscreen War: The various nasty conflicts that broke out on NGE-Earth in the wake of Second Impact. Among things known are that China and Japan both had to deal with nasty insurrections (both sides of the "Hokkaido Insurrection" used Child Soldiers, of which Mana Kirishima was one of), Iran and Iraq were at war (including firebombing each other's population centers), and Pakistan & India "nuked each other into annihilation".
Book 5: There is a mysterious greater threat who has it in for Teana and company.
Book 6: Gamma Team's members learn that their adventures have been viewed by those they left behind on their homeworlds.
Book 10: The mysterious little black-cloaked Keyblade-wielder girl who's been aiding the heroes is Laicixa Testarossa, Alicia's Nobody. And she's brought two friends: Precia and Aqua.
Book 14: The evil little Keyblader named Ruin is the Darkness of Fate & Alicia's Hearts made manifest as a separate being, akin to Vanitas. Alicia's Heart has resided as a passenger inside Fate ever since Fate's creation. And the Big Bad of the series, creator of the Heartless, corrupter of the Night Sky Tome, and leader of the daemonic enemy, is The Dark Voice. Also, there is another multi-realm coalition running around the multiverse, fighting bad guys and righting wrongs.
Book 15: Anyone who has traveled between dimensions has their rate of physical aging permanently and dramatically slowed - for humans and similar-lifespan species, it's to a rate of one year per 300 years (shorter-lived species get more of a boost, while longer-lived species get less of one).
Book 21: Teana's deceased father Tarlis was a Saiyan, making her half.
This Is Unforgivable: Upon hearing how the Incubators have been manipulating countless numbers of races, taking away their ability to self-determinate, and resulting in hundreds of sapient races' extinctions, Legion (whose culture holds the right to self-determination as very important, and its violation a grievous wrong) is understandably pissed.
Kyubey exploded. Everyone jumped from the sudden noise of the firing of an M98 Widow, looking around, and soon spotting the culprit - body trembling slightly, head-flaps forming a yet-unseen configuration, and photoreceptor bearing a reddish tint to its blue light. Despite the being's infancy in terms of possession of emotion, one thing was abundantly clear:
Legion was furious.
"Unacceptable methods" the Geth stated. "Unforgivable transgressions. The ends do not at all justify the means in this situation. Entities designate 'Incubators' violate the right to self-determinate of targeted species, strip sapient races of their right to walk their own path, forcefully manipulate target species' developments to their detriment, steal their target races' futures for their own goals, condemn species to extinction for no true worthy purpose. They are no better than the Reapers."
Time Skip: 108 days between the end of Book 26 (excluding the bonus chapter) and the start of Book 27.
Twitchy Eye: In Book 0, one of the few subtle warning signs that Teana was about to snap – warning signs that Nanoha and Vita, unfortunately, missed.
Values Dissonance: In-universe example; In Sangheili culture, twins are considered "sacred, blessed, a gift from the gods"; you can guess how they reacted when they learned of the torment that Shion had to go through just because she was a twin, and what the Sonozaki view on twins is (them being cursed, and tradition being that the youngest be killed at birth). (Hint: Not well)
Wave Motion Gun: The Starshot's particle-beam cannon. Also, some of the mages' higher-end attacks.
Wishplosion: In Book 18, Madoka's wish is for all present and future Puella & Puer Magi's souls/Hearts to be returned to their natural incorporeal states within their bodies instead of as Soul Gems; among other things, it turns out that Puellae Magi were becoming Witches/Heartless because their Hearts were outside their bodies and thus exposed to the corruptive Darkness of the physical plane, this wish means they're no longer exposed to that, and thus no longer have to constantly keep their Gems clean to avoid becoming Witches. Though Puellae who become Heartless the "usual" ways (succumbing to Darkness or being forcibly transformed by Heartless) will still become Witches, her wish nonetheless means that Puella Magi no longer live with a Fate Worse than Death sentence.