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.
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 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.
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.
Continuity Nod: Lilith once mentioned the Mark of Cain very briefly, which was the mark responsible for her death in City of Fallen Angels.
Cross Over: There is an unnofficial, non-canon crossover between Veronica Carter and Geier and Pan of Orderly Chaos. Hilarity will most certainly ensue.
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.
Dark and Troubled Past: Since the setting is post-apocalyptic, everyone has one of these.
Everyone Is Gay: Not exactly, but the number of gay pairings dwarf the straight pairings. That, and that fact that there is TONS of Ho Yay, with a decent amount of Les Yay thrown in.
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.
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).
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.
Never Got To Say Goodbye: Horrifically done in the final battle. TheArchitect gets a pile of rubble dropped on him. his death is made even worse because it was so sudden, and he was laughing just before he got crushed. His last words were "I haven't had this much fun in--". It was seen by Etzel, the Architect's longest friend, who immediately had a MASSIVE Heroic BSOD and attempted to dig him out of the rubble while screaming that he couldn't leave him. Osiris attempted to stop him but Etzel slapped him aside and continued digging, even when his hands began to bleed. It was one of the most heartbreaking events of the series.
"No. No. No. No, this isn't— no—I won't let this, you've got to, no—Can you hear me, come on, please, dear, just yell, honey— darling—Jason—!!""
Then it's revealed that the Architect is Not Quite Dead, as he barely hung on to life, but he's still alive. Still sad, though.
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. Thier 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.