Ron the Death Eater: Remilia and Yukari. Rounded out later in the series, but UNFORGIVABLY so here.
The Woobie: Ran. She is reportedly abused by Yukari, taken for granted and treated as inferior to Yutaka by Dawitsu, and is almost made to be a bargaining chip as part of Dawitsu's plan to get Yutaka back.
Grimoire of Dawitsu
Cargo Ship: Dawitsu seems to be onto Aya's overly-affectionate treatment of her press...
Chaotic Good: Dawitsu even compares Mamizou to Robin Hood in her antics of pranking and stealing from rich people and giving to poor.
Draco in Leather Pants: Not exactly an extreme example, Dawitsu seems to not mention Yuuka Kazami in too much of a bad light, considering she's quite sadistic, even in Canon. Perhaps it's because he's a Youkai as well.
Genius Bonus: Several of the more scientific-sounding sections are based on high-level scientific principles, and even some of the more basic sciences go into such detail that it can be hard to keep up.
Memetic Mutation: The sheer amount of memes mentioned is practically innumerable in this book.
Strangled by the Red String: Played With.Sakuya and Dawitsu certainly seem to be playing this straight, however, a big subversion comes in at the end, in which Dawitsu decides it's better if they are simply Friends with Benefits. This is further played with by Recompense, in which Sakuya breaks up with Dawitsu because she's found someone who takes her seriously, which triggers the entire events of Recompense...
Moe: Flandre Scarlet has a ton of Moe moments. That, and Yutaka in a Gothic lolita outfit, complete with Nosebleed courtesy of Dawitsu. The Author lampshades how Moe his depiction of Flandre in the Author's Notes of chapter four.
One-Scene Wonder: The Dawitsu Chibi clones that assist Marisa in her battle against Reimu.
Tastes Like Diabetes: Meta example, the Author mentions in the Author's notes that he thinks he's been overdoing the OC x OC and that he's getting Type 2 (self-induced) Dialogue Diabetes. There's actually no overt evidence of this in the book.
Jean's Magical Education
Angst? What Angst?: Dawitsu actually makes a joke about his near-death experience in the last book, which actually surprises himself.
Genius Bonus: Byakuren's 'whirling snake' dream is actually a reference to how the scientist responsible for figuring out the structure of Benzene had his Eureka Moment.
Hollywood Pudgy: Kaguya apparently gets fat from all her inactivity. She dies of a thrombosis, but due to her Immortality, she comes back to life, and gets fat again. So Eirin and Reisen force her to go running and lose a bit of weight.
The Woobie: Good lord, Ran again, and the reason why's only mentioned within the last two chapters, but suddenly a lot more things in the series makes sense... Ran is, and has been for a while, in love with Dawitsu... so she's had to deal with Dawitsu going after Sakuya and pining over Yutaka for God knows how long... POOR RAN!
The Forbidden Love of Yukari Yakumo
Crack Pairing: Sexy!Dawitsu and Idiot!Yukari... when Dawitsu quite clearly sees Yukari as a rival/enemy, and Yukari sees him as a nuisance/idiot.
Designated Hero: Why is it that Dawitsu and Yukari are in the right when Yutaka's been cheated on? Beyond Tokage's narration claiming this love is 'true love'? Also, once Yutaka is indisputably evil, Yukari doesn't really... do much that's heroic.
Draco in Leather Pants: Yukari, in the main series, is closer to Ron the Death Eater territory, but here, she's emphasised as overly beautiful, innocent, wistful, and kind. Dawitsu is no longer a perverse, scrawny Otaku with no luck with the ladies and an annoying streak, but as the hunk of every Mary Sue's dreams. Dawitsu even gets to wear leather pants!
Faux Symbolism: Sunflowers... flowers in general being a running motif... reeks of pretentious writers' attempts at symbolism.
One True Threesome: The ending is basically Idiot!Yukari, Inexplicably resurrected!Hachuurui, and Sexy!Dawitsu all being together in a massive threesome. The end.
Ron the Death Eater: Almost every other character involved except for Yukari and Dawitsu, Yutaka especially so. The only character that doesn't fit into either this or the inverse is probably Yuyuko, but even she is out-of-character.
So Bad, It's Good: Dawitsu finally decides to stop bitching about the awful quality of Tokage's story and instead enjoy it for the easy-to-poke-fun-at crap that it is...
True Art Is Angsty: Tokage certainly thinks so. To quote chapter eleven's author's notes: 'And another thing you won't see in Hebiko's stories are the heart-stopping action and the tragic description of grief that make art what true art is! Painful! Art isn't there to make you feel good, it's there to make you feel bad!'
The Woobie: Subverted. Tokage is someone who desperately wants to write a book, and does. However, practically everyone who reads it hates it, and the one person who does like it ends up hating it also, with most of the copies being bought for the sole purpose of creatively destroying them (if the reviews of the final chapter are anything to go by). She loses her friends over it, and she alienates everyone she tries to become friends with with her social awkwardness, and goes through an unseen, unspeakable torture from Yuuka that leaves her clearly traumatised. At the same time, she mostly deserves all the crap she goes through, and is a genuinely pompous, pretentious, sex-obsessed moron, yet most would agree she didn't deserve the latter trauma...
The Misadventures of Yukari Yakumo
Creepy Awesome: Discussed by Hebiko in the Author's Notes, directed at Yutaka's performance when she first met Reimu and Marisa, saying she'd love to play up her creepy side like that.
Fridge Logic: The narrator has this regarding Yuyuko's gluttony... she realizes she doesn't actually need to eat because she's a ghost...
Genius Bonus: This 'definition'; ' her agreement with Dawitsu had made it infeasible- a word which here means 'of positive Gibb's Free Energy'' refers to an equation in the field of chemistry relating Standard Entropy, Standard Enthalpy Change, Temperature, and the feasibility of chemical reactions.
Jerkass Woobie: Arguably the narrator, on accounts that she lost something she was hoping to raise into an adopted child, yet still does highly morally questionable acts, such as Mind Rape.
So Okay, It's Average: The reaction of Momiji to the book, admitting it's far better than Tokage's, but at the same time can't see it being marketable.
Yutaka's Big Fat Youkai Wedding
Genius Bonus: This speed; 'running from the awkward situation faster than a cathode ray' isn't actually that fast, and most people can run faster than a Cathode Ray.
Tear Jerker: The ending... Yukari and Yuyuko accept the series has ended, and sing 'We'll meet again', while the other characters hear it in their hearts, and seemingly accept their time is up as well...