* AlternativeCharacterInterpretation: All over the place. Some are very common amongst the general fandom, such as Flandre's [[MadwomanInTheAttic isolation-driven]] madness, Mokou's [[WhoWantsToLiveForever immortality-driven]] madness, Rumia being a SealedEvilInACan, Eirin and Kaguya being long-time lovers, and [[spoiler:Sakuya being a Lunarian]], but some are entirely unexpected, such as Suika being an exile and [[spoiler:Yukari being suicidal]].
* CrowningMomentOfAwesome: Among a few others, [[spoiler: Reimu stabbing Remilia in the heart with her broken Gohei]].
** Patchouli's secret weapon against the [[ZombieApocalypse Kashoyo?]] [[spoiler: Metal sign: Assault Rifle!]]
** Eirin and Kaguya's [[TakingYouWithMe suicide rush]] on the Kashoyo attacking Eientei, and subsequent recovery.
* CrowningMomentOfFunny: Marisa is chock full of them.
** "MARISA’S THE MIGHTY’S BIG BOOK OF AMAZING GREATNESS".
** "Only Marisa can prevent forest fires." ''...What does that even mean?''
** "Now, because it's ''mees'' doin magics, probably'll explode a lots. Let's move away from the ghost girl's houses."
* CrowningMomentofHeartwarming: Sakuya has several while she learns about the PowerOfFriendship.
** Patchouli gets one as well, after coming to the realization that she's kind of a jerk to Koakuma.
** Eirin helping Reisen through her depression with hugs and lullabies.
* LesYay: Reimu, Marisa, Sakuya and Youmu [[AuthorAppeal all end up experiencing or witnessing various levels of undress with others]], but only Marisa has made a passing joke about Reimu being in love with her; generally, these girls are hetereosexually squicked out. Then again, it's ''VideoGame/{{Touhou}}''; there [[ImprobablyFemaleCast isn't much alternative]]. Also, Kaguya and Eirin are canonically in love, and a non-canon sidestory has [[ExplicitContent Reimu and Sakuya having sex]].
* {{Moe}}: Koakuma. Oh so very much.
* NightmareFuel:
** The Kashoyo. Zombie fairies (and not the cherub kind) who can survive being torn limb from limb, even going as far as reforming into regular zombies. All while smelling horrible and making a ghastly chittering noise.
** Flandre, in her first appearance.
* PuritySue: The author is an open Yuyuko fanboy. Let's just say it shows.
* {{Squick}}: Reimu's initial reaction to finding [[spoiler:giant naked and anatomically correct statues of Sakuya and Flandre in Remilia's mind]], until she realizes that there's nothing sexual intended by it. Also, everyone's reaction to the [[spoiler:Kashoyo.]]
** A far more serious example, the room where Sakuya prepares Flandre's meals.
* TheyWastedAPerfectlyGoodPlot: Reimu gets all of [[spoiler: Yuyuko's]] powers! ....And doesn't really do much with them.
* TheWoobie: Most characters become this at one point or another, but for the classic version, Koakuma best fits.