'''Fate/Stay Night Fanfic'''

* ArcFatigue: Many feel that the story should have ended once Shirou defeated [[spoiler:Dark Sakura]], and that the subsequent [[spoiler:birth of Angra Mainyu]] as well as the following battle culminating in [[spoiler:the summoning of all Servants across the {{Franchise/Nasuverse}}]] stretched the story to the point it lost its coherence, notably by adding unecessary stuff ''that weren't even planned'' from the recent ''VideoGame/FateGrandOrder'' (for perspective, ''Fate/Grand Order'' came out ''five years'' after the fanfic started). Even the [[WordOfGod author]] admitted that the story length got out of hands and it tired them to finish it.
* CatharsisFactor: [[WordOfGod Andy Moczo]] ''detests'' Shinji Matou (a sentiment many fans of FSN share), so any time he appears his efforts to do anything productive will end in him being a ButtMonkey - but because he ''does'' go too far each and every time, his subsequent clobbering is complete LaserGuidedKarma and he avoids being an IneffectualSympatheticVillain.
* [[HoYay Les Yay]]: [[spoiler:Caster Alter and Sakura]]'s... [[UnusualEuphemism mana]] [[MemeticMutation transfer]] {{r|unningGag}}itual.
* NightmareFuel: Chapter 15 contains a scene where we see Matou Zouken [[spoiler:assimilate an innocent's essence as he performs a GrandTheftMe upon her body]]. Reading it is both horrifically creepy and heartbreaking.
* TheScrappy: [[spoiler:Caster Alter]], to readers who believe she has overstayed her welcome and survived situations she should not have too many times. Most such readers felt the character should have been an ArcVillain (and assumed as much) instead of lasting until the story's climax - which veers dangerously close to Villain Sue territory, if not necessarily crossing right into it.
** [[spoiler: TakeThatScrappy / AlasPoorScrappy: Making her rather horrible death one of these, depending on personal taste.]]
** Other readers feel this way about [[spoiler:Saber Alter]] after she regains her sanity, feeling that she is essentially a complete OC that is nothing like her previous incarnations and don't feel like her becoming a BloodKnight makes much sense as a resolution to her character arc. The implication that she is somehow "stronger" as a result is even less well-received.
* ShockingMoments: The FinalBattle in Chapters 42 and 43, what with [[spoiler:Illya and Sakura taking advantage of Angra Mainyu weakening the barriers between dimensions to summon ''the entire Throne of Heroes'' in order to fight Angra Mainyu]].
* TheWoobie: Both Illya and Sakura. The former seems to be becoming an IronWoobie here, as well. [[spoiler: The later seems to be reaching WoobieDestroyerOfWorlds like in canon.]]