Accidental Hero: Elena, in an attempt to stop Eureka from leaving, tries to ram the Nirvash with her own IFO. Her timing is such that she hits Truth instead. To her annoyance, Ao and Fleur congratulate her for her help.
The second Secret is a massive floating carrier which launches swarms of smaller Secrets that resemble the first one (albeit scaled down to fighter size).
Génération Bleu's assault landers like the Triton are small versions, being able to carry up to three IFOs.
The Gekko when it appears in episode 13-14, even if it is derelict and empty.
America's Fortress-class IFOs introduced in episode 18, which can carry four standard American IFOs.
Alien Geometries: The Secrets come in various shapes and sizes. The weirdest one is in episode 6, being essentially a giant, weaponized swing carousel. Ao comments on this in episode 12, comparing the Secret to a jack-in-the-box. It's somewhat unusual that they start appearing uniform and humanoid past episode 14.
All There in the Manual: Kanon, the strange machine known to the cast as IFO-0, is labeled as an LFO by the show's website.
Alternate History: Due to the appearances of Scub Coral and Secrets throughout human history, Ao's timeline has been changed radically compared to the real world. The world population is about half that of the real world. Nuclear power was invented but never developed due to the catastrophic destruction a Scub Burst would cause were it to catch a power plant in the blast. The Soviet Union and China suffered heavily from Scub Bursts. It can thus be assumed that the Cold War never came about, since the Soviet Union would not be a threat in that state, hence why it has not collapsed in Ao's timeline. Finally, a Scub Burst in Tokyo crippled Japan just after WWII, leaving it behind-the-curve.
Alternate Timeline/Alternate Universe: It quickly becomes apparent that the history of Eureka Seven AO is different from the one presented in Eureka Seven, but what isn't known at first is why. Several characters refer to the events of the original series as happening in "another world", but then the Gekko is stated to come from 10,000 years in the future. The final episodes confirm that the AO and original E7 worlds are in fact completely different universes. This is made abundantly clear not only in the dialogue, but we get to actually see this as Ao fires the final shot of the Quartz Gun, blasting a hole right into the original E7 universe that we can actually look through.
Anti-Villain: The Secrets, surprisingly. Eureka goes so far as to say they aren't humanity's enemies. The one that actually talks is polite and quite forthcoming, in a robotic sort of way. That said, their mission is to eliminate the Scub, and they aren't going to negotiate on that, regardless of the collateral damage.
Area 51: Shows up in episode 18. It's used as a staging ground to launch aircraft which look suspiciously similar to the military airships in the previous series.
The Ark: The PoseidonSpace Station is this. In addition to serving as a storage facility for quartz, it's meant as a sanctuary for key personnel (IFO pilots and their equipment, support personnel for the same, and probably the higher-ups) in case disaster befalls Earth.
Arm Cannon: The Nirvash gets one of the Kryie's spare cannons to replace its missing arm in episode 4.
The Wave Motion Gun in episode 16 is a giant, self-propelled cannon that attaches to the Nirvash's arm.
Armor-Piercing Question: In episode 5, Fleur asks Ao, "Why are you here [at Generation Bleu]?" He doesn't get it the first time, but when she repeats it with more emphasis, he finally understands.
Artificial Stupidity: The drones launched by the Secret in episode 10 are programmed to kill humans, which they accomplish by identifying things shaped like a human. This makes them target store mannequins, and makes them completely incapable of figuring out that humans don't just disappear when they hop inside a tent. The Secret itself also seems incapable of distinguishing between human and human-shaped IFO.
Artistic License - Military: Maybe in-universe, maybe not. Ao refers to Niki Tanaka as a Colonel, but the markings on his uniform identify him as a Major. For his part, Tanaka doesn't bother correcting Ao, merely asking him to go by a First Name Basis.
Art Shift: Near the end of the OVA, the news report shifts from regular animation to real-life photos of people for a few seconds.
Attack Drone: Two Secrets have used drone fighters, the first for anti-air and the second for anti-infantry.
Renton's Nirvash has a bunch of small funnel-like weapons that possess surprising destructive power for their size. The Movie!Nirvash it's based on had them, too, but these appear even more powerful.
Awesome, but Impractical: The Quartz Gun. It's incredibly powerful and can one-shot several Secrets at once, but it has an unfortunate tendency to change the timeline in unpredictable ways. Which, equally unfortunately, makes Ao unwilling to risk using it on Truth.
Back from the Dead: In episode 17, a protest against the presence of the Scub at Okinawa turns deadly when they launch a smoke bomb at some of the workers. In the confusion, the plant worker that showed Ao around in episode 4 trips and falls to his death. The Scub then absorbs him, only for Naru to emerge moments later with the man alive and well.
There's an interesting aversion: The Quartz Gun's Cosmic Retcons don't seem to bring back deceased individuals. That said, Truth does come back, but as the Nirvash's Archetype.
Bad Future/After the End: The end of Episode 22. Civilization appears to have collapsed, there are North Pole Lights everywhere, and Renton's become a Fallout-esque nomad waiting for a chance to travel back in time. It's later explained that the Secrets went to town on humanity due to their connection with the Scub.
Balkanize Me: The island of Okinawa has declared itself independent from the rest of Japan. There are still tensions between the two, hence the Okinawans' mistrust of foreigners (which includes people from Japan).
Saudi Arabia has split up into several countries, including the Republic of Fisal Arabia.
BFG: The Quartz Gun. It's so large that the Nirvash needs both arms to carry it, and it has its own propulsion system.
Big Damn Heroes: Gazelle rescues Ao when the men of the island have kidnapped him.
Eureka, piloting the Nirvash, and the Gekko saves Ao from a fiery death by reentry in episode 12.
Major Tanaka shows up with a coalition IFO squadron to back Ao up when the Chinese forces (based on the red with yellow stars flag) refuse to let Pied Piper extract the Quartz. He got there a couple minutes late to stop the first salvo, but backs him up from there.
Elena and Fleur rescue Ao from the Americans in episode 18.
Bishonen Line: The Humanoid Secrets seem to be more powerful than the non-humanoid variants.
Bittersweet Ending: Ao eventually rescues his mother and reunites her with his father. However, his nature as a Half-Human Hybrid prevents him from going to the Eureka Seven universe with them, as it would cause a Taken for Granite effect due to the high trapar. With his final use of the Quartz Gun, Ao is then sent wandering in time. He eventually returns to 2027, two years later in his own timeline, but it's quite probable that his interference has changed the world so radically his friends may no longer remember him. Nirvash is gone, as well, meaning he's all alone - although Ao is optimistic about seeing Nirvash again.
Black Box: The Third Engine. No one knows how it works. When active it can absorb trapar directly from the atmosphere for fuel, giving the IFO theoretically limitless flight time, and the Nirvash has increased speed and maneuverability while using it, but there's clearly more going on. They can duplicate the technology, since other IFOs possess them, but attempting to activate it does nothing. Elena and Fleur do eventually manage to get theirs working, but it only lasts as long as it needs to for them to rescue Ao, then shuts off almost immediately once he's free. Elena creditsThe Power of Love, which, given the previous series, is most likely the exact reason it worked. It activates a second time for Fleur in the finale, but nothing comes of that.
Blush Sticker: Elena in episode 21. Funnier still, her helmet also has them.
Brick Joke: In episode 4, Ao mentions that he plans to give his father a good punch if he ever meets him. Twenty episodes later, he tries to do exactly that, but Ivica holds him back.
Bring Him to Me: Both the Japanese government and those vying for Okinawa's independence resolve to bring Ao into their custody after word gets out that he has blue hair and managed to make the Nirvash work. The former because they could never get the titular Humongous Mecha to work, the latter to sell him to the former in exchange for independence. The Americans are also after him, apparently to test their mettle against the Nirvash and the boy piloting it.
A similar situation occurs in episode 13 when Eureka, the Gekko and a different Nirvash appear, with American and Japanese forces approaching from opposite sides and Generation Blue already at the ship. Everyone comments on their reasons being related to what happened 10 years ago, but they don't realize that due to Time Travel this is the first encounter, not the second.
Broken Masquerade: Faced with a Secret army bearing down on the world's active Scub Coral facilities, Christophe Blanc spills the beans about the Quartz to the world. His superiors are none too pleased, as they wanted the Quartz for themselves. This also has repercussions later on, as other countries are quite reluctant to let Generation Bleu keep hoarding the stuff.
Bunny-Ears Lawyer: Rebecka is the only member of Team Pied Piper that isn't eccentric in some way. This is to be expected of the children, of course, but even Ivica has his moments of daffiness.
The head of the maintenance crew also seems pretty normal.
The last scene of the first opening of AO is exactly the same as the one of the first opening of Eureka Seven.
The opening sequences that include Eureka show her wearing the exact same flower hairpin Renton gave her in the final episode of the first series. She's also wearing the same outfit as Renton's sister Diane in the original series.
Ao also appears to use the Cut-Back Drop Turn in combat in the second episode.
There's a picture with shot by shot comparisons of scenes and symbols from the original series to Ao, seen here◊.
The logo behind the singer during the protest rally looks identical to the Gekkostate logo, and even has "GS" written on it.
Ao wears the goofy tracksuit Renton wore in the original series during his stay on the Gekko in episode 13.
The Mind Screw sequence in episode 14 contains a visual reference to a sequence in episode 47 of the original series.
The new opening has a musical one in the middle part, not a surprise since it's by Flow (the ones who did the first opening of Eureka Seven).
Ao also pulls Eureka into the Nirvash in the same fashion as Renton did for Eureka in the original series, though for obvious reasons it goes smoother when the other party doesn't have an arm in a sling.
Episode 17 gives us "Konpaku Drive Is Activated" when Ao levels the Quartz Gun at Truth.
In episode 22, Renton scavenges from the wreck of the dove-shaped ship seen at the end of the movie.
In the derelict ship, you can see the little toy-LFO Renton had in the original series.
Renton wears basically the same Federation uniform that Dominic wore in the original.
Renton's Nirvash is a more mechanical version of the Spec-V from the movie.
The thing Truth fuses with after being blown up in a fusion explosion looks like a distorted Nirvash Type The END. He even calls it "Archetype" several times.
In the final episode, the scene where Renton is holding a crying Eureka mirrors Ray and Charles when they see Renton off. Coincidentally both happen at episode 24 in their respective series.
During the finale, in the last half, the background music is a remixed version of Niji (Rainbow) from the last episode of the original series. It can be a bit hard to hear through the dialogue and explosions, but it's there.
Calling the Old Man Out: Gazelle calls his father out on treating Ao like crap, and by extension teaching the next generation to do the same.
Ao and Fleur plan to do this to Christophe Blanc in episode 8, only to discover that what looks like callousness on his part was actually a Batman Gambit to save the day while keeping the Americans from interfering.
Ao plans on doing this to his father if he ever meets him. He gets to. Nirvash to Nirvash.
Chekhov's Gunman: The Okinawan man Ao helps in episode 4 reappears in episode 17. Episode 4 also name drops "Johansson", whose importance is revealed in future episodes - he's Truth's adoptive father, and wrote a book saying that history is being altered.
At one point, Eureka tells Ao that the Nirvash Mark One looks like the Nirvash Renton is building. In the final scene in episode 22, we see Renton and his finished Nirvash, which resembles the Spec-V from the movie.
Children Are Innocent: It's being shown that the next generation of children are finally subverting the "blame everything on the blue-haired people" trend, with Naru's little sister and a young boy (in the manga) who ignored his mother's warnings to stay away from Ao.
Child Soldiers: Generation Bleu's IFOs can only be run by children, and the Nirvash responds to Ao alone. Averted by the American IFOs, which are flown by adults. Episode 11 explains that this is due to a phenomenon similar to Desperation Disease in the original series, but with far happier consequences; children exposed to high concentrations of trapar have brain abnormalities that make them excellent pilots. Adults, by comparison, aren't nearly as capable as pilots, barring the "Coral Carrier" squadron introduced in episode 21, which can see trapar like Ao can.
Given a nod in episode 18, where Pippo, browsing a search engine, passes by an article which calls attention to Generation Bleu using child labor.
Cleavage Window: Elena and Fleur have to wear Fanservicey, cowgirl-esque outfits that prominently feature these in episode 17, as part of a photo shoot. Fleur is less than amused by this; Elena, however, is clearly having fun with it... and Fleur's discomfort.
Clock Roaches: The Secrets describe themselves as this. When communication is established with the head of one Japan recovered, it claims that its creation is part of nature and that its sole mission is to eradicate the foreign Scub Coral. However, they are more intelligent than most Clock Roaches, being willing to negotiate on the point as long as it meets their goals. Christophe Blanc makes a contract with them to eliminate the Quartz using the Quartz Gun as a proxy, since the Secrets know it's capable of beating them. This way both parties win: no Scub Bursts and no Quartz.
Conspicuous CG: Whenever a vehicle is still or doing a basic animation.
"Welcome Home, Eureka" reappears in the first two episodes. The message changes to "Welcome, Ao," in the third episode.
In episode 6, Chloe wakes up in the hospital to find Ao there. In episode 15, they switch places, as Chloe notes when Ao wakes up.
Ao dreams of every Secret he's ever fought in episode 16.
Continuity Snarl: This series seems to have trouble differentiating between original!E7 and movie!E7 LFOs, and for that matter has trouble with the original series' timeline. Eureka is clearly from the original, yet the spec2 she pilots is the movie iteration (the original never had shoulder-mounted lasers). She's also piloting the spec2 well after it should have evolved and subsequently vanished, and there's no explanation as to where she got this one. Further to this, the Nirvash that Renton shows up in seems to be an armored version of the evolved Nirvash, despite the previously mentioned vanishing. TheEnd is in Generation Bleu's basement, intact and in its white color scheme, although shortly after being freed from said basement it gets vaporized. None of this is ever sufficiently explained.
Cooldown Hug: Ao gives a metaphorical one to Elena during her nervous breakdown in episode 21.
Cosmic Retcon: The Quartz Gun can do this by erasing the appearance of the Scub from the timeline. The Scub have also been doing this throughout human history, traveling back from the future after initially traveling from the Eureka Seven universe to various points in the past and radically altering history.
Cranial Processing Unit: Surprisingly averted with the Nirvash. Truth tears its head off in episode 13, yet this has no effect on Ao's ability to pilot the machine other than briefly stunning him.
Crossdresser: Ao spends most of the OVA dressed as a woman, forced upon him by Fleur and Elena, and more than half of it dressed like his mother.
Cutting the Electronic Leash: Rebecka does this in episode 20 to symbolize that she's finally done trying to work with Big Blue World when they have already shown they won't support Generation Bleu any further.
Death from Above: The Secret in episode 8 shapeshifts into a giant missile to take out the Scub Coral.
Defcon Five: There's no progression demonstrated, but the show nevertheless gets this right when Generation Bleu goes to Defcon 1 in the face of an imminent and unavoidable attack.
Determinator: Secrets chasing after the Scub Coral no matter where they escape to in order to destroy them. Think of it as a cat and mouse chase.
Diabolus ex Machina: The revelation that the Eureka Seven universe is fatal to hybrids, which took Ao's sister and keeps Ao from ever returning home.
Distressed Dude: Ao is briefly abducted by some of the men of the island because they hope to offer him to the Japanese military in exchange for their independence.
Or Chinese, because Okinawa apparently seceded with Chinese assistance and is now their dependency or protectorate. Or whoever, really — it's pretty clear that for the most part they did it simply because they need someone close at hand to blame.
Dream Sequence: Subtly hinted at in episode 7 with regards to Ao. His scenes on Iwato Jima feature slight color desaturation, while all the island scenes before that point are colored normally.
Dreaming of Things to Come/Dreaming of Times Gone By: Something like this occurred in episode 7, given that Truth really did take Naru, but did so at the plant coral facility, presumably at the exact moment Ao showed up in the dream. Naru later explains that Ao's consciousness was there, even though his body wasn't.
Dynamic Entry: The above-mentioned Big Damn Heroes is accomplished by Gazelle and his friends driving their FP through the wall of his father's house.
Elaborate Underground Base: Génération Bleu's HQ is built within an excavated structure in the Scub Coral which looks suspiciously similar to the Tower Cities from the first series.
Eleventh Hour Superpower: Ao's Cosmic Retcon in Episode 23 changes the Nirvash's appearance. Episode 24 then reveals it has gained an Archetype in Truth. Notably, Renton calls it the Nirvash Neo - which was presumably its name to begin with.
Enemy Mine: Episode 20 reveals that Christophe Blanc made a backdoor deal with the Secrets, pledging to help them get rid of the Scub Coral in return for the Secrets not interfering in human affairs. The Secrets accept the proposal and Japan agrees to shelter and sponsor the remnants of Generation Bleu.
Epic Fail: When Ao launches the Nirvash for the second time, he disengages two pistols built into its side. Since it's missing an arm, one predictably falls into the sea.
E.T. Gave Us Wi-Fi: It's implied the technological boost of this world compared to the real world (even accounting for the setting being 13 years in the future) is due in part to reverse-engineering technology found in the Scub. Also inverted; see Alternate History above.
Even Evil Has Standards: The Okinawan SDF is willing to sell out Ao and Naru to avoid trouble with the Japanese. Nakamura's attempt to shoot Ao, however, is universally met with disgust.
The swing carousel Secret in episode 6 spins, as befitting the carnival ride it is based on. This allows it to attack with its flails (the cars on the ride) and kicks up seawater into a hurricane that shields it from attacks.
The Kanon can create a trapar storm by spinning in a circle.
Didn't really think that whole "use a Secret as a weapon against our enemies" plan through, did you, Lt. Nakamura? Much destruction ensues. Rubbing salt in the wound, Christophe Blanc manages to successfully ally with the Secrets and enlist them as military aid.
On the other side, the (implied to be artificial) Coral Carriers used as IFO pilots by America unexpectedly begin growing large masses of Scub from their bodies after being exposed to high trapar levels, which is essentially the Scub converting their bodies into more Scub. That's what happens when you try to exploit an organism that instinctively assimilates things.
Episode 2: Ao's hair color is brown in the opening (it doesn't change until Ao starts the Nirvash later on in the episode). It's blue-green◊ in subsequent episodes to reflect current events.
Episode 3: There's an added shot of Eureka in the opening, facing away from the camera, when Ao is chasing the bracelet.
Episode 4: Eureka turns to face the camera◊ in this episode, revealing the jewel on her forehead which she had in the final episode of the previous series (up until this point, every flashback shot of Eureka takes care to obscure her forehead, either by having her bangs block it or using camera angles to avoid it). She's also transparent instead of solid. Following episodes use the same shot.
Episode 5: The Nirvash gets repainted in this episode, which is reflected in the ending credits. The opening isn't changed.
Episode 15: The title card changes, glowing yellow◊ instead of clear as in episode 14.
Episode 17: Team Goldilocks is replaced◊ by Team Harlequin in the opening, and their IFOs are replaced◊ with an unidentified IFO (which turns out to be Truth in episode 20). Their removal is due to the team itself being erased from history, though the girls are fine.
Ao has the purple-with-red-ring eyes of a Coralian. Unlike the previous series, this is actually explored beyond simply marking him as part-alien. The design of his eyes allows him to perceive trapar.
Truth has vertically halved pupils.
Explosive Overclocking: Of a sort. Until the finale, Ao never fires the Quartz Gun at full power, yet it is still absurdly destructive. In the finale, when he finally gets it to 100%, the resulting blast is strong enough to destroy an army of Secrets larger than the first one he blew up, the Scub formation below him, punch a hole between universes, and finally completely destroy the gun and total his mech in the process.
Eye Beams: Used by the humanoid Secrets in episode 21. It could also apply to the Secret in the pilot, since it fires from a visor-like eye.
Face-Heel Turn: Both Elena and Team Harlequin defect to the Allied Forces during the events of episode 20, though Ao seems to talk some sense into the former by the end of the next episode.
Sort of happened earlier to Maggie Kwan, though this was due to a Cosmic Retcon.
Failed a Spot Check: In episode 13, Truth takes the form of Eureka to trick Ao. Ao would not have fallen for this if he had stopped to consider some obvious problems with the disguise, namely that "she" obviously isn't pregnant and isn't wearing the same clothes (Truth has taken her form as she dressed in the previous series, minus the gold collar). Ao does eventually notice that she isn't pregnant, but far later than he should have. Truth even lampshades this.
Falling into the Cockpit: Literally; Ao is launched from Gazelle's FP and lands on the Nirvash. Ao does at least rationalize that the controls are similar to a normal FP, but he didn't know the Nirvash was an IFO at the time. It's lampshaded later on, when Ao can't figure out any of the subsystems and comments that it's not as easy as it looks in anime.
False Flag Operation: Truth does this in episode 19. He destroys a bunch of Allied Forces and American satellites, for which Generation Bleu is blamed, while the debris is used to destroy the Poseidon, which Generation Bleu blames on the Americans.
Fantastic Racism: Ao and Eureka get a lot of flak for being foreigners. The fact that they seem to attract monsters certainly doesn't help. The worst part is that Gazelle's dad pretty much outright admits that Ao had no control over the circumstances that lead the adults to hate him, but he won't forgive him anyway.
Fauxshadowing: There were a lot of hints that Elena wasn't quite a normal human. Besides the obvious ones, such as her visions of the original series, there were also more subtle moments, such as the the camera lingering on Elena in episode 5 when there was discussion about Ao's unique eyes, or her Non-Answer to Fleur about whether she could see trapar in episode 12. As episode 21 revealed, this ultimately amounted to nothing: Elena is just a human Time Traveller from the 1980s who was made aware of the Eureka Seven world as a consequence of her trip through time.
Feed It a Bomb: The Secret in episode 10 is essentially a giant clam which releases Attack Drones from its mouth. Since its armor is too tough to penetrate, it's defeated by tricking it into releasing another wave of drones, at which point Fleur and Elena fill it full of ordinance.
Finger Gun: In episode 6, Truth does this at Generation Bleu's entrance checkpoint, complete with "BANG!" The checkpoint explodes.
Five-Token Band: The pilots of Hannah's Team Harlequin are black, Indian, and Chinese respectively.
Flying Car: Trapar allows modified cars, called FPs ("Flying Platform"), to hover off the ground. Okinawa has the largest concentration, but trapar mining allows them to be used in other places.
Forbidden Chekhov's Gun: Albeit a self-imposed one. Ao's new Wave Motion Gun will rewrite history each time it's used. Ao's not willing to risk it after the first use makes it so Team Goldilocks is never formed.
Foreshadowing: One of the few segments of the story that didn't end up Left Hanging was in episode 13, when Eureka says that exposure to Scub Coral would be dangerous for her baby. We see how dangerous it is in what has to be the most upsetting moment in the Eureka Seven franchise in the finale. See Taken for Granite for details.
Forgotten Phlebotinum: After Ao gets his Mid-Season Upgrade, he fails to remember to use it until episode 22 (where it fails horribly), even though there is at least one instance where it would have defeated his opponent with ease.
Freeze-Frame Bonus: Several episodes have fairly detailed reports, messages, and other things which pass by fairly quickly. Most are written in English.
Frickin' Laser Beams: Preferred weapon of the Secrets. The humans are shown to use them in a limited capacity, too. The Nirvash Spec-2 is equipped with Homing Laser Cannons.
Friendly Enemy: The Secret casually chats with Ao in episode 17, without a hint of animosity.
Funny Background Event: While Ao argues with his teammates at the pool, Noah clambers awkwardly onto a table in the background and knocks everything off it.
Gag Boobs: In episode 17, during a photo shoot, Fleur complains about a poster featuring chibi-fied versions of herself and Elena with comically oversized breasts.
Get a Hold of Yourself, Man!: In episode 18. Fleur slaps Elena when she starts ranting about having killed Miller Joe. Elena slaps her back and storms off, leaving Fleur to fall to her knees. It technically worked, in that Elena focused her energies on an equally irrational but at least more productive task. Fleur, herself conflicted for other reasons, needed an extra push from Gazelle.
Godwin's Law: Comes up in episode 21. When Nakamura goes on about making Japan the greatest nation on Earth, the Secret points out that others have made that claim before. To its credit, the Secret cites Napoleon and Alexander in addition to Hilter.
Gazelle: I hope you aren't going to tell me that Germany and Japan won World War II!
The Good, the Bad, and the Evil: Although there a number of factions with shifting alliances, by the last few episodes of the series we have the alliance between Pied Piper, the Japanese, and the Secrets as the Good, the Allied Forces as the Bad, and Truth as the Evil.
Ao, with the help of Gazelle and his friends, steals the Nirvash from the Japanese at the start of the series.
In episode 14, Naru steals the Nirvash spec2 after it leaves Eureka to hold off Truth (a fight it loses).
Elena steals the unused Credo in episode 20, since at the time her own IFO wasn't operational. Truth also steals the Kanon, which was kept isolated under Generation Bleu HQ, by merging with it.
Gratuitous English: All over the place, though it's pretty good English most of the time. Episode 6 has a notable instance of an entire report written in English, and not very well at that.
In episode 16, there's a screen that says "QUAETZ", despite the accepted (and most likely official) translation is "Quartz".
Green Rocks: Quartz. Especially in episode 16 where a big clump of it suddenly turns into a Wave Motion Gun. Episode 17 reveals it enables time travel and Cosmic Retcons. Ultimately turns out to be an alternate form of the Scub.
Groin Attack: Gazelle learns the hard way that Rebecka is not to be trifled with when he rolls out of the rear compartment of the Triton and right onto her chest.
He Knows Too Much: Rebecka is prepared to eliminate Gazelle and his friends after they learn the secret of how Génération Bleu neutralizes the Scub Bursts. Fortunately for them, Christophe Blanc decides to give them a job instead.
In the final episode Ao, maybe. He doesn't die, but he's sent wandering through time and he might have negated his history.
Hero with Bad Publicity: Generation Bleu's revelation about the Quartz seriously damages their worldwide reputation, since they kept it secret. That Ao made a giant cannon out of it probably isn't helping. Then Elena and Fleur, in rescuing Ao after he went with the Americans, got the entire organization labeled as a terrorist group.
Real Robot/Super Robot: Despite the fact that they can only be piloted by children, the IFOs are Real Robots - and their weapons are mostly bullets and missiles. The Nirvash Mark I hasn't even moved on its own (except for Eureka) and the reason it can only be piloted by Eureka and Ao probably has more to do with genetics than destiny. On the other hand, the Secrets are extremely and inexplicably alien, while Truth is from a different genre of show entirely.
Gazelle's dad, whose half-assed apology to Ao for behavior he acknowledges but refuses to change only makes him that much worse.
The sister of the guy who helps out Ao in episode 4. The guy took Ao by her shop so he could get something to eat, and she wastes no time ratting Ao out to the Allied forces because she thought she'd get a good finder's fee.
Incredibly Obvious Tail: Invoked in episode 8. After Ao tries to take the Nirvash to look for Naru, Christophe Blanc lets him off with a warning, only to have Gazelle and his friends spy on him with all the subtlety of a brick to the head. Fleur quickly figures out that he ordered them to behave that way on purpose; the purpose wasn't to spy on Ao, but to make it clear that he was being watched.
Ironic Echo: In episode 9, Fleur jokes that she won't rescue Ao when he drowns. Later on, the Nirvash runs out fuel and begins sinking. Elena and Fleur pull it and Ao up. Elena then calls Fleur out on this.
In Spite of a Nail: The erasure of an entire Plant Coral facility from history seems to have no large-scale effects on the timeline, just minor ones for certain individuals.
A similar thing happens when Truth is erased. Most notable is the fact that Naru is almost completely unchanged, despite Truth being the defining factor in her transformation previously.
The fact that this world's history is quite different from ours didn't change the fact that Nimitz-class nuclear carriers were developed, or that Ronald Reagan was elected President of the United States.
It's the Only Way to Be Sure: This is the Secret's reasoning behind Scub Bursts. They detonate upon contact with the Quartz to make absolutely sure nothing is left behind.
Kick the Dog: The adults living on Okinawa encouraged their children to practice Fantastic Racism against Ao and Eureka and to harass them, simply because they blamed Eureka for the first Scub Burst.
Burning down Fukai's house, even though the culprit is never shown. This is after they covered the fences in graffiti and broke all the windows with rocks.
Kinetic Weapons Are Just Better: In contrast with the previous series, where beam weapons were fairly common, humans seem to primarily use conventional firearms in this setting.
Lampshade Hanging: Compared to the original this series has very few example of homing lasers. When they do pop up in Episode 15 the pilots are extremely surprised and Elena asks how they could be homing despite not being missiles. It is played for drama rather than laughs as Ao doesn't do a good job avoiding them.
Laser-Guided Karma: Nakamura thinks this is the case when Okinawa gets attacked because it has Scub Coral, which they only have control of because they ceded from Japan with help from the Allied Forces.
Latex Perfection: In the Wounded Gazelle Gambit broadcast mentioned below, Pippo wears a face mask that makes him look completely different. A somewhat more realistic example than most, since the mask does not have to pass most types of inspection. Pippo's scene is short and non-speaking, so the mask isn't upset by facial movements and the viewer doesn't get a very good look at it.
Legacy Character: The Nirvash isn't the original. Initially it's stated that it was owned by the Japanese and built with parts from various nations, but it is ultimately revealed it was originally constructed by Renton.
Like Cannot Cut Like: As Truth discovers, one Secret cannot harm another. This apparently only applies to those of similar make, though, since one type of Secret is shown to be capable of harming another in episode 21.
Losing Your Head: A Secret in episode 14 is destroyed by Ao, but the Japanese are able to retrieve its still-active head. The head can even communicate, albeit in radio waves that require a translation medium so humans can understand.
Lost Aesop: The original Eureka Seven series spends a good deal of time exploring the idea that humans and the Scub can coexist peacefully without trying to destroy each other. By the time of Eureka Seven AO, however, even Renton & Eureka (the poster-couple for humans-and-Coralians-can-totally-be-friends) agree that they are dangerous invaders and should be destroyed with extreme prejudice.
Both episode 16 and 23 give Ao some upgrades too. First the Quartz Gun, a very powerful weapon capable of wiping anything from history and, in the finale, a slight re-design to the Neo Nirvash (formerly only known as the Mark-One), including an Archetype.
Mind Screw: The dream sequence in episode 7 where Ao tries in vain to stop Truth from kidnapping a willing Naru, only to wake up in a hospital bed and learn that the dream was more or less real.
Episode 11 and Elena's hallucinations.
Naru's visions in episode 14.
Ao's dreams in episode 16, as well as the ending of the episode.
Moral Dissonance: Naru genuinely believes truth is a kind person for not killing Ao, despite the fact that Truth had callously killed dozens of innocent people beforehand. True, she didn't witness most of it, except for the one time where Truth demolishes a plant coral facility right in front of her with the workers still inside it.
Ivica is Croatian or Serbian (possibly former, as Ivica is a much rarer name in Serbia)
Rebecka seems to be Swedish
Fleur is Swiss
Elena is American, but still looks like a Mukokuseki (which turns out to be for good reason)
Cristophe Blanc, the head of the Génération Bleu and Fleur's father, is also Swiss
Maev and Chloe McCaffrey are Scottish
Mushroom Samba: Episode 11 has Generation Bleu's IFO pilots being driven mad through a combination of airborne trapar and a sentient dust that clings to them. Team Goldilocks takes their IFOs for a joyride to chase down a giant teddy bear they believe to be their former chief, Fleur obsessively tries to save her mother, Ao believes he's back on Iwato island, and Elena is followed around by a dust clone of Miller, a singer and spy (whom she's been impersonating) and tries to take Ao to the "real world" — the Eureka Seven universe.
Eureka dropped out of the sky one day (specifically, the Nirvash appeared from the same pillar of light that Scub Coral emerges from, and Eureka fell out of it), gave birth to Ao not long after, then disappeared during a Scub Burst when Ao was three. Episode 13 sheds light on how this occurred.
The blurry yet unmistakable form of Anemone's TheEND in its final form from the previous series is apparently being held by Generation Bleu. This is never explained.
Elena Peoples has serious identity and identity theft issues, and believes herself to have come from Ao's world. In reality, Eureka pulled her into the future when she was about to be caught in a Scub Burst in the Caribbean, depositing her at a Scub Burst in the same location about forty years ahead. Her real name is Ellen Brooks, and she just assumed the identity of the Elena Peoples killed in the latter Scub Burst. It's hinted Elena herself knows this, but saw images of of the future Earth and wanted to be part of it.
A very subtle one. In Episode 21 it's revealed Elena Peoples saw the world of Eureka Seven while Time Travelling and became obsessed with finding it again. This is basically what happened to the members of Gekkostate in the Alternate UniverseCompilation MoviePocket Full of Rainbows/Good Night, Sleep Tight, Young Lovers.
In the last episode Archetype Truth's screen image resembles the Nirvash's larval form from the same movie.
In episode 23, Truth's stomach light blinks in the same fashion as Renton and Eureka's heads did in the final episode of the original series.
In one of the first episodes, Ao fights a Secret that looks a lot like an enlarged version of the two-man Lift Board Eureka and Renton borrowed from Holland in the original anime.
Negative Space Wedgie: When the Quartz Gun is fired in episode 16, it retroactively left behind the "North Pole Light", a giant beam of light that arbitrarily stops in the upper atmosphere. Despite being weird, it's not indicated to be dangerous. The Bad Future is full of them, which suggests some major disturbance happened.
New-Age Retro Hippie: While the independence protesters in episode 4 are a fairly diverse crowd, several of those featured in prominent shots fit this trope.
N.G.O. Superpower: Apparently, Génération Bleu wields such a clout that it can pressure the Swiss government into issuing passports to its agents on a moment's notice.
A backdated passport with the fake visas and entry stamps of previous countries (Gazelle's new one is dated 2022 and has a US entry stamp) is something that even real life spies don't get all that often.
Its parent company, Big Blue World, is nearly on the same level. Their ability to influence the media is apparently so great that Rebecka believes (perhaps not unjustifiably) they can influence world opinion by themselves.
The Secret in episode 15 implies that Eureka taking the unusually large piece of Quartz from the Scub near Okinawa ten years ago is responsible for the current unexplained reawakening of the dormant Scub. Episode 17 suggests that the missing Quartz simply came back, since it can time travel.
Elena and Fleur take it upon themselves to rescue Ao in episode 18. Though they succeed, they just got the whole of Generation Bleu branded terrorists.
The last episode reveals the whole mess was caused when the Scub left the Eureka Seven universe. Renton is trying to fix it by destroying the Scub.
Had Ao not hesitated to shoot Truth with the Quartz cannon in episode 17, it would have saved everyone lots of trouble and prevented Fleur's father from being killed.
No Communities Were Harmed: There's several significant differences between the political makeup of their world and ours, but the originals aren't hard to decipher.
Faisal Arabia in Ep. 8 is an anti-American Arab republic explicitly shown on the map in the place of a modern Saudi Arabia, which is an absolute monarchy. Apparently, the Arab Spring continued in their world; however, why the population elected to rename their nation after one of their former kings just after overthrowing the current one is an open question.
Ivica's unnamed home country is probably Srpska Kraijina or Yugoslavia as a whole judging by the hints in Ep. 10, being a loose federation of notoriously hard to make to get along South Slavic nations, torn by ethnic and religious differences.
No Ending: The series ends with nothing really getting resolved, besides Eureka and Renton returning to their home universe and Ao erasing the Okinawa Scub Coral from existence. Other than than that, every other plot point was either ignored, turned out to be a Red Herring, wasted, or left too open ended to be conclusive in any way.
Nothing Is the Same Anymore: Episode 20, which is the culmination of three episodes of tension. Team Pied Piper is now working with Japan and the Secrets while the rest of the world is set against them.
Not So Different: When the Japanese carrier is sunk in the second episode, the Okinawan navy moves in to rescue the survivors, with one of the captains yelling that they all have Japanese blood in them.
Oh, Crap: Everybody starts crapping their pants when the Nirvash, which hasn't been operational for over 10 years, suddenly starts moving again.
Episode 15 has every inactive Scub worldwide come back to life, and an army of Secrets to match.
Only the Chosen May Wield: The Nirvash only responds to Ao, and Eureka before him. This also applies to the Third Engine. Every IFO has one, but only Ao can make it work consistently.
OOC Is Serious Business: Euerka and Renton are trying to destroy the Scubs? That's a clue that things are really bad.
Out-of-Character Alert: Truth blows his cover as Christophe Blanc when he asks Fleur to abandon her friends. Her father is not so out of touch that he would think she'd go along with such a suggestion.
Outside-Context Villain: No one knows what the Secrets are, just that they show up when the Scub does and attempt to destroy it. Then there's Truth, who can't even be scratched by any conventional means.
Painfully Slow Projectile: In episode 2, Gazelle's FP is fired upon by what is very clearly a Phalanx CIWS. Even though it's supposed by be a warning shot, and thus it's understandable that they weren't hit, the rate of fire is ridiculously slow, like it's just a regular machine gun. Here is what the Phalanx being fired actually looks like. Averted later on; a military FP with a roof-mounted heavy machine gun tears through a drug farm so fast the people being shot at barely get to react.
Paper-Thin Disguise: After being Locked into Strangeness, Ao tries to hide his turquoise hair with a cap. It doesn't really work. He gets a hooded sweatshirt later which does a somewhat better job, but he had to pull the hood down eventually.
Patient Zero: Once Scub infections start becoming more common, Naru becomes this. Technically, though, she's just the first case, not the one transmitting it (directly, anyway).
Pet the Dog: Gazelle gets Ao some sleeping pills when he's being kept up by bad dreams, and doesn't charge him since they're from the same island.
Plot Armor: Truth slaughters Red Shirts by the dozens, but leaves the named characters conveniently alive. Particularly noticeable with Rebecka, who ends up knocked out by the same attack that was instant death to everyone else.
Damaged Quartz, the byproduct of a Scub Burst, can attract a Secret or another Scub Coral is sufficient amounts are gathered in one place.
High amounts of trapar cause brain mutations in children which makes them good pilots. This is most common around Scub mining facilities. The Kanon emits even larger amounts of trapar, which reacts badly with Coral Carriers. Finally, a Half-Human Hybrid really gets the short end of the stick.
The Power of Love: Elena jokes about this when she and Fleur manage to get the Third Engine running, only for it to shut off later. Taking the previous series into account, this is probably accurate, a fact which the finale seems to confirm.
Power Trio: Génération Bleu rapid response teams seem to operate on this principle. Pied Piper was short one prior to Ao joining.
For the record, Ao is the Ego, Fleur is the Superego, and Elena is the Id.
Ramming Always Works: The Secret fighters in episode four simply smash through their targets to attack. The one in episode 8 takes the novel approach of just dropping on the Scub like a missile from the upper atmosphere.
In episode 14, Elena rams into Truth by accident. The reactions of both parties make it almost comical. It didn't actually work (he got knocked out of the fight for a couple minutes, but that's it), but it was the single most effective attack anyone ever managed.
Recursive Ammo: The Nirvash's new weapon in episode 14 fires missiles which in turn fire beams or smaller missiles after reaching their targets. It instantly shreds a skyscraper-sized Secret.
Egregiously, Nirvash type TheEND. After briefly appearing in episode 7, it reappears in episode 20 to be unceremoniously blown away by the other hidden thing under Generation Bleu's base, Kanon.
Even more egregiously, Elena Peoples. Despite having visions of the Eureka Seven timeline, episode 21 reveals she is in fact from the 1980s, having been brought to the future by Eureka to save her from a Scub Burst. She just saw visions of Eureka's timeline on the way.
There were some implications that Ao's sister might be an existing member of the cast. Nope, she died as a baby. She wasn't Elena at all.
Ret Gone: In episode 16, the Norwegian Plant Coral is erased from history. As a consequence, Team Goldilocks is never formed, though its members are fine. Episode 17 later shows this to be a direct consequence of using the Nirvash's new Wave Motion Gun, and that the gun is actually fixing history.
In Episode 23 Truth erases himself. In the final episode it turns out Truth wasn't entirely erased, but Ao erases the Okinawan Scub Coral and possibly his own history. (Ao himself still exists, however).
Ripple-Effect-Proof Memory: When history is changed in episode 16, only Ao remembers how things originally were. Elena may also remember, though it's not clear; she does know that the Quartz Gun changes history by erasing Scub Coral, but doesn't reveal that she knows what changed.
When faced with it again in episode 16, now as a target instead of a spectator, she complains that they're cheating.
The Scapegoat: In episode 14, Ao is blamed for the murder of Colonel Endo in the previous episode (Truth was actually responsible), as an excuse for the Japanese to take both him and the Nirvash. On a larger scale, Nakamura does this to the Scub Coral itself, deeming it an infection which the Secrets are trying to contain. That part is actually true.
Scenery Gorn: Generation Bleu HQ going up in flames then collapsing wholesale in episode 20.
When the military tries to kick Génération Bleu out (generally regardless of which military it is), Rebecka usually orders Elena and Fleur to deploy anyway, so when the military inevitably finds themselves out of their depth, Génération Bleu can swoop in and save them from their own ignorance.
Rebecka pulls a gun on the Governor of Arizona to make him issue an official assistance request in episode 10.
Elena and Fleur mount a rescue mission for Ao of their own accord in episode 18. This was not good press for Generation Bleu, but Christophe Blanc thought it was pretty funny.
In episode 20, Rebecka finally decides to quit taking orders from Big Blue World and throw her lot in with Generation Bleu.
Sense Loss Sadness: A subdued version in episode 12. Ao, who can see trapar, has a minor freak out when he goes into space, where there's almost no trapar. He's quick to adapt, though.
Elena frequently makes references to anime and related material.
Ep 3: While in Okinawan custody she's seen wearing a wig and striking a pose with leek that mimics Hatsune Miku. She also excitedly discovers a new music video, which appears to feature a girl with twintails and a leek.
Episode 16 shows a random bystander wearing a Suda 51 shirt (which happened in another Bones series, Heroman), and the dream sequence where Ao is surrounded by the Secrets he defeated is an exact homage to the final scene of Neon Genesis Evangelion.
Heck, there are a lot of scenes that reference Evangelion, such as the red sea in episode 11.
Then there's the Secret that tried to divebomb the scub coral. It's reminiscent of an Angel who tried doing the same thing to Tokyo-3.
The secondary parts on Secrets (drones, regenerating battering rams) are referred to as Options.
Episode 17: The TV show that Elena and Fleur are mentioned as having is finally revealed, and the art style looks JUST like Panty & Stocking with Garterbelt. Unsurprisingly, Elena is responsible for the story.
Episode 22: Renton bears a striking resemblance to fellow BONES mecha protagonist Takuto from Star Driver.
Eureka Seven AO: Jungfrau no Hanabanatachi, the OVA version, features not only good ol' Elena doing her usual blatantly obvious reference, but you'll only spot that if you can get over the fact that AO COSPLAYS HIS MOTHER!!! And he pulls it off, too, which is Lampshaded later on.
Smug Snake: A lot of various high-placed idiots around the world, but the cake as of now goes to the Arizonian Governor in episode 10.
Snow Means Death: Eureka and Renton bury their baby daughter in the middle of a winter's night in Episode 24.
Soft Water: In a flashback, Eureka drops out of the sky from a significant height, hitting the water head-first. She was already unconscious on arrival, and nearly drowning seems to be the only concern when she's pulled out.
Sorting Algorithm of Evil: The Secrets seem to get progressively stronger, culminating in the extremely tough humanoid Secrets that appear in episode 14 and beyond. Just to demonstrate the difference, three humanoid Secrets effortlessly kill the same type of Secret fought by Ao in episode 2.
Spell My Name with an "S": More in pronunciation, though. Ivica's name is pronounced with a "ch" in the series, while in real South Slavic languages that use Latin script, such as Croatian and some dialects of Serbian, it's actually pronounced as "ts". Zigzagged in that in his surname, Tanovic, the same letter is pronounced as "ch".
Justified, because in Serbian Cyrillic that's two different letters. Actually, in Croatian Latin, too, as that properly should be Tanović. Ironically, on the official site his name is spelled exactly that way, but the authors apparently didn't get that a one small accent means a completely different sound in this case.
Spin-Offspring: When the series was revealed, the initial announcement didn't mention the name of Ao's parents. They didn't need to - it's pretty obvious just from looking at him that his parents are Renton and Eureka.
The opening spoils the fact that Ao will join Team Pied Piper, which doesn't happen until episode 4. His hair color change wasn't spoiled, oddly enough, even though every other bit of media gladly gives that away.
To a lesser extent, there's Team Goldilocks. The girls appear in the opening, but their leader does not, foreshadowing that he doesn't walk away from their first appearance.
The second opening gives away the fact that the spec2 Nirvash will be an enemy, and that the final form of the movie Nirvash will appear (though it is obscured by shadow, anyone familiar with the movie will recognize it instantly). It's not the actual movie Nirvash, though, just one that happens to look the same. The Wave Motion Gun in episode 16 also appears, but that's only for a few frames and the Nirvash is just carrying it, disguising its actual purpose. A similar thing occurs with Kanon, which replaces Team Goldilocks's mecha in the opening after episode 17.
Stable Time Loop: A rather simple two-iteration one. Eureka's appearance in 2012 was the second time in her experience that she went to AO's Earth; the first occurs during the plot.
Starfish Aliens: The Scub, as in the previous series, with the added bonus that they now have the ability to manipulate time as well as space. The Secrets have hints of this, too, in that they are lifeforms that appear in the form of inanimate objects.
The Stinger: The end of episode 6, where Truth begins his attack on Generation Bleu. The same scene with no alterations opens episode 7.
Major Tanaka aids Han and Pippo in connecting the disembodied Secret to Georg in episode 15.
Episode 20 has Team Pied Piper joining forces with Japan and the Secrets to eliminate the Quartz with less collateral damage.
Taken for Granite: The lethal effects of a high trapar environment on a Coralian/human hybrid, as Renton and Eureka found out when Eureka gave birth to Ao's sister. This is why Eureka went to another world - so that Ao could be born in a place where he would survive.
Team Pet: Noah becomes this to Génération Bleu after he takes a liking to Ivica.
There Are No Therapists: Ao really needs to sit down and talk to someone after he comes into possession of a weapon that can change spacetime and 'fix' the universe, but at the cost of altering events and people without their knowing it.
Elena is a bundle of frayed nerves and beserk buttons since this universe isn't her home and she's pretended to be at least two people, screwing up her own sense of identity.
Time Skip: Early materials made a point of saying the show took place in the year 2025. Some viewers noticed that Freeze Frame Bonuses from the original Eureka Seven said the year was 2005 (even though the series turned out to be in the far future.) So there must be a twenty year gap between both series, right? Wrong, AO is in a separate universe. It is also unclear exactly how much time has passed for Eureka and Renton between both series.
The Tokyo Fireball: Tokyo no longer exists, having been pretty much vaporized by a Scub Burst 70 years ago. Nagoya is now the capital of Japan.
Too Dumb to Live: The Okinawan government tries to kick Génération Blue out of the country after the first Secret is defeated, reasoning that they can handle the Scub and refusing to believe it's still active even though Génération Bleu are the experts on such things (and possess the only weapons capable of harming it). Predictably, they end up needing help when things fall apart.
The entire population of the island the action takes place, really. After the first episodes they, with a few notable exceptions, come off as dumb, greedy, inefficient racist bullies who just vented their frustration on Eureka and Ao and tried to exploit them however they can, instead of figuring them out and, maybe, finding a solution. And then they wonder why they get their asses whupped by Secrets. One high-ranking member of the Okinawa military at least had the good sense to apologize to Génération Bleu when it becomes clear that their arrogance created another window for a Secret to appear.
Génération Bleu also expresses frustration at how they constantly have to remind their clients that conventional weapons are ineffective against Secrets.
Japan's Ministry of Defense hatches an absolutely bonkers plan to capture a Secret and use it as a weapon. Predictably, this fails horribly.
The US Army (or, probably, National Guard, as they seem to be under the orders of the Governor at the time) is hardly better, trying to protect Phoenix from the Secret by conventional military attacks.
The Chinese gets on Generation Bleu's case for extracting the Quartz. When questioned on what they plan to do about any Secrets that appear, they arrogantly state that the Secrets are assumed to be dead. Nothing comes of this, though; Ao extracted the Quartz anyway.
Touched by Vorlons: Those infected by Scub Coral are formally referred to as "Coral Carriers" in episode 21. It grants them the ability to see trapar like Ao can, at least in certain cases. It's noted that Okinawa seems to have the highest concentration, and they flock to Naru (the most developed case). As discovered in episode 22, getting infected with a lifeform that assimilates living tissue into itself predictably goes awry, though it's isolated to a few cases so far.
Transforming Mecha: As in the previous series. The Nirvash can go from jet to humanoid, as can Fleur's Alleluia. Notably, the transformations of everything except the Nirvash are much more limited. Alleluia is the most humanoid of them all, and it still has massive fold out scanners attached to its arms. Elena's Kyrie does little more than fold out legs and a head. Finally, the American IFOs switch from jet to something resembling a one-legged bird.
The Tunguska Event: Although not stated directly, it's mentioned there was a continuous series of Scub Bursts around Siberia in 1908, referencing the real-world event.
It's later revealed that it was actually caused by Kanon.
Ungrateful Bastard: The residents of Okinawa blame Eureka and her son for their troubles, even though the alternative would have been the complete destruction of their island. It's implied that they're just being used as scapegoats since Okinawa's independence suffered in the ensuing struggle for control over trapar mining in the region.
Whatever Hannah and Eureka discussed, which seems to be having an effect on the minds of a lot of people.
The Secret tried to explain why the Scub Coral around the world was suddenly reactivating, but Ivica interrupted. This gets an explanation in episode 17.
Unwanted Rescue: Ao willingly goes with the Americans in episode 18, due to being conflicted over the use of the Quartz Gun. Elena and Fleur show up to rescue him, which he is initially resistant to. They win him over pretty quickly by convincing him to due what he wants, rather than what he thinks is best for everyone else.
The Virus: The Scub acts like this when it gets inside a human. Naru is the first (and most developed) case, and a rash of infections pops up after the worldwide reactivation of the Scub in episode 15.
The Triton (and presumably others of its class) has two.
The Nirvash uses one in episode 16. It's made from pure Quartz, shaped by the Nirvash, and kills an entire army of Secrets with a bunch of roboteching giant lasers that leave a giant pillar of light in their wake. It also erases Scub Coral from history when fired. The first shot makes it so Team Goldilocks is never formed.
We Win Because You Didn't: In episode 16, in order to prevent the Secret army from causing worldwide devastation, Generation Bleu plans to sacrifice its stocks of Quartz to destroy them at the north pole all at once, where the Scub Burst will do no harm. The disembodied Secret, still linked to Georg, knows about the plan but doesn't care. Whether the world over or just in one spot, they've succeeded in their objective (destroy the Quartz), while Generation Bleu has to give up the Quartz either way. Unfortunately for them, Ao found a way that screwed them entirely.
Wham Episode: Episode 7, also a Mid-Season Twist. Coming on the heels of a Mind ScrewDream Sequence experience for Ao, it's revealed that Truth has kidnapped Naru. The aforementioned Dream Sequence suggests that she may have gone with him willingly because she believes he's the giant that protected her as a child. There's also evidence that she has supernatural powers, and that a certain LFO from the original series is under Generation Blue Headquarters.
As of episode 11, the show feels like it's almost addicted to Wham, since it had four Wham Episodes in a row!
Episode 11 shows that Elena is not who she says she is, and even she may not be clear on who she really is. Her name isn't her actual name, and she also took the identity of a pop singer/spy for America. She may also be from the original universe.
Episode 12 has Ao saved by the Gekko and a pregnant Eureka in the Nirvash type ZERO spec2.
Episode 13: The origins of Eureka are revealed, and it is explained where she came from and why she disappeared ten years ago. Truth is hinted to be a Secret Eureka faced before vanishing. Finally, Ao receives a message from what is apparently future!Eureka, saying that the Secrets are not their enemies.
Episode 14: Though there's plenty to go around, but a couple points stand out. Eureka's baby is actually a girl, at least according to the doctors she consulted. Also, when she goes back into a pillar of light, she's picked up by the blasted to hell and back wrecked but alive torso of a Nirvash. Episode 14 starts off answering questions and ends by doubling the number of them.
Episode 16: Ao manages to defeat the Secrets by turning all of the collected Quartz into a Wave Motion Gun. However, in doing so he's apparently altered the timeline, preventing the formation of Team Goldilocks by erasing the Scub Coral facility where their parents were employed.
Episode 17: The Scub Coral and the Secrets have been altering history. Also, Eureka is not anchoredin time.
Episode 20: Generation Bleu (as an organization) is destroyed, and Team Pied Piper joins up with Japan to do the Secrets' work for them, since they can do it without causing Scub Bursts. Elena has also defected and Truth merged with a Ax-Crazy LFO that wreaked havoc across Russia before it was subdued.
Episode 22: The Eureka Seven universe is a Bad Future now, but Renton has another Nirvash and looks set to travel back and set things right.
What the Hell, Dad?: Fleur tries to call out her father in episode 12 when he tells them to not try to rescue Ao, who is on course to burn up in reentry, calmly accusing him of allowing it because Ao was an alien. However, there really was nothing anyone could do without falling to the same fate, and he apologized for that reality.
Generation Bleu catches a lot of flak for hiding the existence of the Quartz.
Elena does this to Fleur in episode 18, calling Fleur on never asking about any of the suspicious things she's done, namely the grave she made for the Miller wig. Fleur explains that while she was curious, she didn't ask because she thought Elena didn't want her to.
The Worf Effect: Team Goldilocks is deployed and quickly defeated in episode 5, which means Team Pied Piper is called in as backup.
Wounded Gazelle Gambit: In episode 8, America tries to cancel Pied Piper's mission in Faisal Arabia, as a Scub Burst there would potentially cripple the country, which supports various terrorist groups. In response, Christophe Blanc has Gazelle and his friends portray victims of the Secret on television, garnering international support for their rescue and thus forcing America to concede to public pressure.
You Can't Go Home Again: After defeating the first Secret, all the various factions (of ambiguous motives and morality) are trying to find Ao and the Nirvash, forcing him to go into hiding. Then his home actually burns down. This convinces him to join Génération Bleu and leave the island entirely (well, this and the fact that doing so might allow him to find his mother). The trope doesn't stick, though. Once Ao joins Generation Bleu, he's able to go back whenever he wants, though the one time he tried (two if you count the dream) didn't go so well.
Even though he's never been there, it turns out Ao can never enter the original Eureka Seven universe his parents come from - the trapar there is lethal to him.
You Didn't Ask: Fukai reveals that he had at least some idea of why Ao's father was never around, but since Ao emphatically thought of him as a deadbeat and never wanted to hear about him, Fukai never mentioned it. Ao has to concede the point.