Gadgeteer Genius: Pretty much all Sparks, but the Heterodynes were notable even among Sparks.
Von Mekkan: In my experience, a strong Heterodyne will take about two hours to truly warp the laws of nature.
Gambit Pileup: Agatha's arrival in Sturmhalten causes everyone to set off their master plan at once. And when Agatha and Zola reached Castle Heterodyne, everything just went nuts.
Also, this entire exchange between Gil and Tarvek.
Tarvek: So, Wulfenbach — just checking — is this going to be some kind of macho exercise where you insist on battling a potentially superior opponent alone in some kind of misguided attempt to "prove" your intrinsic worth? Gil: No, no! I'm only that stupid in front of Agatha! Tarvek: Drat.
Gentle Giant: Punch, apparently, though most people who didn't know him assume he's just Dumb Muscle. Also possibly a Genius Bruiser, though the evidence for that comes from the Jägers who are... not the best at determining who's "schmott".
Belloptix: But... didn't he have a... lighter side? Maxim: Oh yah! He build very amuzing toys for de orphan cheeldren!
God Guise: Lucrezia Mongfish (a.k.a. The Other) is worshipped by the Geisterdamen.
Goggles Do Nothing: Dimo (green Jäger with 5 o'clock shadow, wearing an olive-drab cap with mustard trim and a yellow ostrich plume stuck in).
Going to Give It More Energy: Zola drinks a last-resort combat stimulant to be nearly unstoppable. Violetta — who she stole it from — sticks her with a dart... not with a poison, with more of the same, figuring that an overdose of already near-lethal stuff would kill her more reliably than anything else.
Good Cop/Bad Cop: Anyone and Bangladesh DuPree. It happens both intentionally and just because she actsas usual.
Good Is Not Dumb: Everyone thinks that just because Gilgamesh Wulfenbach never built a Death Ray and almost never screams at people or beats them up to get them under control, they can push him around and act like he's nothing. When he's finally pushed over the edge, he shows the entire world that yes, he does know how to build a Death Ray, and yes, he's perfectly capable of kicking the crap out of Europa to protect his father and not-girlfriend.
Good Is Not Nice: Gil; Agatha; Master Payne... Quite possibly Klaus.
Grand Theft Me: Lucrezia attempts this on several occasions on different characters. How successful she is varies:
Agatha is able to shrug it of, thanks to her locket, later by sheer force of will.
She later succeeds at it fully with Anevka.
Her try with Zola fails, because Zola's brain was prepared with a trap for exactly that occasion. Zola now has a replica of Lucrezia's psyche inside her mind and can sift through the thoughts and memories of it more or less at will. Due to Zola's injuries and her overdose on MoveIt, nobody knows who is in control now.
Gratuitous French: Gil once started speaking French while delirious. Translated: "Excuse me sir, but where is the catastrophe?" Gil spent a lot of time in France when he was younger — and he spent so much of that time coming to the rescue of apparentdanger-prone ditz Zola that it's just short of reflex for him to keep an eye out for disasters when she's around.
Jägermonster = hunter-monster, Geisterdamen = ghost ladies, Sturmvoraus = storm ahead, Wulfenbach = "Wolf's stream" (not strictly correct, but German is dialectual and it's a place/family name). Of course, since this story is apparently set in a 19th century Central Europe not totally unlike our own, this is more of a Translation Convention, since German actually would be the lingua franca of the setting.
There is one straight-up bit of gratuitous German when a Jäger uses "Jägermonstern" as a pseudo-German plural for his own kind. The German plural is in fact "Jägermonster", which of course sounds rather odd in English.
Note also the writing in the last panel of this page.
Holzfäller, the fake surname Gil used in Paris, translates as "lumberjack".
Sturmhalten, the home of the Sturmvoraus familiy (see above), literally means "to keep storm", a.k.a. Storm Keep. This matches with Mechanicsburg, burg being old germanic for "castle". Wulfenbach started as a smaller house, so their fortress is just Castle Wulfenbach.
The helmet which allows Castle Heterodyne to possess the Seneschal.
In a "Trelawney Thorpe" short story, the crown of King Arthur, which allows Arthur to possess its wearer.
Haunted Technology: Castle Heterodyne is generally seen as this, and it suits Wulfenbach to let people believe it. The application of Clarke's Third Law effectively makes it so; even characters familiar with the machinery refer to the rooms as "alive".
Head-Tiltingly Kinky: When Agatha is working in the traveling Heterodyne Circus as the psychic Madame Olga.
The Jägers, who at first appeared to be little more than comic relief and have since been revealed to have more layers than an onion. It's even been lampshaded in canon.
Given what he will do for those he cares for, one wonders if Tarvek might have avoided the worse of his family heritage.
Hidden Elf Village: The Lost Kingdom of Skifander, where Zeetha comes from. Notably, it's lost to her as well, as she has no idea how she got to Europa.
Homicide Machines: Virtually every piece of advanced technology can be used as a dangerous weapon no matter what it was meant for originally.
Gil: What about this one? It looks like a toaster. Agatha: Well, it is a toaster. Sort of. Gil: Sort of? Agatha: Oh, yes. It could toast the whole town.
Baron Wulfenbach says early on that he would rather his men criticize him rather than fear him too much to tell him important information — in fact, the first time we see him, he's testing Gil to see if he'll tell him he's wrong. It's one of the many signs that he's not your average Evil Overlord.
Gil and Agatha seem to prefer advisors like this as well.
Horrifying the Horror: The mere mention of Barry Heterodyne's name is enough to make two separate incarnations of the Other shit a brick.
Hunter of His Own Kind: Othar Tryggvassen (GentlemanAdventurer!) He's a spark, with a goal of killing every other spark, then killing himself when he's the last one left.
Hyperspace Mallet: Not actually a mallet, but just about every other gadget that a well-equipped Mad Scientist might require.
Idiosyncratic Episode Naming: Each volume of the print collection is titled "Agatha Heterodyne and the Noun Phrase", where the noun phrase in question refers to some person, place, or thing that does indeed appear in that volume, but is never actually referred to by that name.
Carson von Mekhan: Sure, the Heterodynes were dangerous lunatics— but they became our dangerous lunatics!
Moloch von Zinzer stands out because, like the natives of Mechanicsburg, he's a natural minion, but unlike the Mechanicsburgers, he has a certain amount of insight into Spark psychology, and can use this to get them back on target when they inevitably get sidetracked.
I Just Want to Be Normal: Said by Agatha, in the beginning. Othar thinks the entire idea is hilarious.
The Jägermonsters. It still hasn't been established what it would take to kill one of them, and they are amongst clanks as shock troops — Baron Klaus shows particular respect toward them. When Maxim, Dimo and Oggie are introduced, they'd been hanging in nooses for days, casually observing and commenting on the town. It's implied that Othar conned them into getting into the nooses voluntarily.
General Zog: Sir — dere iz a time to twit nancy-boy feetsmen und a time to crush bogs.
In the Blood: Sparkiness is usually hereditary. Spark styles of invention too.
Agatha: I believe another forty-five point three seconds, and I would have exploded or something. Castle Heterodyne: ... or something. Under the circir/circumstances I/I am forced to admit that yo/you are most most likely oneoneone of the family... Agatha: Oh, yeah... I have got to try thatagain! Castle Heterodyne: yesss... most likely, in/in/indeed.
Agatha: We're just going to kill you, and then you'll be fine! (later...) Gil: I've changed my mind! Let's just kill him! Agatha: Stop it. We're going to kill him properly.
