Aerith and Bob: There are characters with names such as Veronica, Kyle, Ethan, Theo...and then you have Umbra, Naoutha, Bezaliel, and Ignis. Then there's Dieter, whose name cannot be properly pronounced by anyone.
Big Bad Ensemble: Shadowhunter Peril has multiple prominent villains, despite Valentine being the main target. He's already completed his Evil Plan and just wants to mop up any pesky rebellion. Lilith, his most prominent Dragon, wants to kill Umbra and Ignis. Oblivion just wants to fight and kill anything he can, so this automatically puts him at odds with the Resistance. Abbadon is more or less a mixture of Oblivion and Lilith's goals, although this has yet to be seen because he is a new character. Nix may or may not become a Big Bad, and his intentions are so far unclear.
Cross Over: There is an unnofficial, non-canon crossover between Veronica Carter and Geier and Pan of Orderly Chaos. Hilarity will most certainly ensue.
Half-Human Hybrid: Multiple examples. Warlocks are the products of a human and a demon mating, and Kyle is a phoenix-human hybrid. Faeries are the product of a demon and an angel mating. Nephilim do not count in this story because, even though they are half human, half angel, in the Bible, Shadowhunter Peril's Nephilim are humans augmented by angel blood. Yet they still have human parents.
Made of Iron: Oblivion should not be able to shrug off some of the things that happen to him whenever he fights Puriel. Veronica is practically the definition of this trope, although she manages to avoid criticism by using it for comedy.
No Biological Sex: The angels in their natural forms, although when they take a physical form they may choose to become male or female. All the angels introduced to date identify as male, though no one has gotten close enough to verify their claims (despite Veronica's insistences.)
Our Angels Are Different: These angels aren't the fluffy, white-winged, halo-sporting heavenly advisors one often thinks of. Instead, angels are violent. And they have issues. Lots of them. But, they're considered to be the most powerful species out there, so if anything their surprisingly human emotions and flaws make them all the more dangerous.
Our Demons Are Different: These demons have human forms, and then there are their nightmarish forms they were born with. The Greater Demons command a certain element, physical or emotional, of any kind, found on Earth. Their universal mother is Lilith, first wife of Adam.
Satan: Averted, for now , since Lucifer never actually appears in the RPG (although mentioning him will drive Puriel into a rage), but another Satan-like figure, Asmodeus, appears briefly in a flashback.
Anyone Can Die: Made horribly clear in the final battle, when multiple characters who had existed on the RP for a while are fatally wounded or in some cases, killed, just seconds after the final battle starts.
Badass Normal: The Architect, who is the only human to appear in the RPG. While surviving the supernatural apocalypse as a human is commendable in itself, he also goes on to explain how he was stalked and hunted by a werewolf pack, then turns the tables on them and kills them all. With a pistol.
Big, Badass Bird of Prey: Ra and his phoenix army. Just take a moment to consider it: MASSIVE, 7-9 foot tall birds of all colors, wearing identical sets of golden armor. Each phoenix breathes fire, and there are hundreds of them.
Big Damn Heroes: The Resistance as a whole. At first they were just a ragtag group of downworlders and Nephilim trying to survive, but since then they've added Greater Demons, angels, phoenixes, and humans to their rank, and they are now widely recognized as a fighting force to be reckoned with within Valentine's city.
Darker and Edgier: The entire story is much more violent and adult than the book series it is based on. Notable examples include multiple death scenes through flashbacks, and onscreen. Ethan's entire backstory could qualify the RPG for this trope alone.
Heroic Sacrifice: Umbra does one of these almost immediately after being introduced to the story. He gets killed by his own mother. However, it turns out that his physical form can be destroyed and reformed endlessly, so he didn't really die (even though his spirit went to Hell).
Marijuana Is LSD: More like a case of Marijuana Is PCP. One time before the final battle, Veronica eats pot brownies—the amount is never specified, but it's safe to say it was at least a few. Considering the fact that this is Veronica, her using a substance is REALLY bad.
Breather Episode: The entire point of it was to bridge the gap between the first two story arcs, and offer some lighthearted moments between the characters so Shadowhunter Peril wouldn't seem completely depressing all the time.
Attack of the 50-Foot Whatever: Veronica's creatures now freely roam the world, constantly looking for new victims to capture or eat—and they've gotten bigger.
Crapsack World: While the world under Valerntine's rule was just as devoid of life, Veronica's world has degenerated it even further—her variety of monsters have forced all hiding survivors to flee from whatever rock they were under, and out into the open world.
Darker and Edgier: Hoo boy. Shadowhunter Peril itself was dark in comparison to the books, but this alternate universe leaves it in the dust. Compared to the original arc, which was peppered with humor and had an overall light tone for most of the time, Veronica's world has absolutely no humor. There are scavengers, monsters, demons, and feral downworlders given completely free reign. It really emphasizes the Apocalypse espect and how far the world has gone.
Divided We Fall: After Veronica betrayed the Resistance, she used her power to capture several of their members and holds them prisoner in her castle. Anyone who is still free, is roaming the continent trying to stay alive, no longer focused on her.
Haunted Castle: Veronica's home, her massive black marble castle, also houses several hundred demons within its walls.