History YMMV / OshiNoKo

** There's quite the overlap between fans of this series and ''Manga/ActAge'', especially after the latter's cancellation, which caused many to jump ship to this series due to its overlapping themes.

** [[spoiler:The circumstances that allow Ruby to learn about who killed Goro and Ai, and the subsequent hardening of her heart, proved very divisive. On the one hand, Ruby had been out of the main plot for a long time and hadn't received main focus since the prologue; with this development, some fans argued that it was the kick in the rear she needed to finally become active in the story. On the other hand, some fans felt like the reveal cheated Ruby out of proper character development, as rather than learning this information on her own she was told it by a death deity, and many feared that it made her a carbon copy of Aqua at his most revenge-obsessed too quickly.]]

** Attaching ''Mephisto'' to every cliffhanger ever[[labelnote:Explanation]]Like the [[https://tvtropes.org/pmwiki/pmwiki.php/Memes/JoJosBizarreAdventure <--To Be Continued-- - -/Roundabout]] meme from ''Manga/JoJosBizarreAdventure'', in Japan, it's become a meme to play the first few bars of ''Oshi No Ko's'' ED to any show's cliffhanger-like scenes and editing what's written on ''Oshi No Ko's'' episode card with a hilarious replacement related to the show they used. Here's exhibit [[https://www.youtube.com/watch?v=uQfkTnfGagE A]], [[https://www.youtube.com/watch?v=Q6fjAiqH6B8 B]], [[https://www.youtube.com/watch?v=uB31g4gjagw C]], and [[https://youtu.be/VVCwgkIUN88 D]] just to name a few.[[/labelnote]]

* LesYay: Some of Ruby's reactions to other women go beyond the classic fangirl attitude, for some readers. Ruby was openly ogling Minami and gushing over Frill when they first met, and she even had [[WingdingEyes a heart in her eye]] when talking about Frill. Not only that, but Ruby was incredibly happy about getting to breastfeed off of Ai, and as Sarina, she had [[WingdingEyes hearts in her eyes]] when talking about how cute Ai was.

* LesYay: There are various scenes in the series that some fans view as implying that Ruby is attracted to girls. For example, Ruby was openly ogling Minami and gushing over Frill when they first met, and she even had [[WingdingEyes a heart in her eye]] when talking about Frill. Not only that, but Ruby was incredibly happy about getting to breastfeed off of Ai, and as Sarina, she had [[WingdingEyes hearts in her eyes]] when talking about how cute Ai was.

* LesYay: There are various scenes in the series that some fans think shows an implication that Ruby is attracted to girls. For example, Ruby was openly ogling Minami and gushing over Frill when they first met, and she even had [[WingdingEyes a heart in her eye]] when talking about Frill. Not only that, but Ruby was incredibly happy about getting to breastfeed off of Ai, and as Sarina, she had [[WingdingEyes hearts in her eyes]] when talking about how cute Ai was. That being said, the only person she's ever explicitly had feelings for is [[spoiler:Goro, and one of her motivations for becoming an idol was to marry him someday]].

** The opening song, [[https://www.youtube.com/watch?v=ZRtdQ81jPUQ "Idol"]] by Music/{{Yoasobi}}, is an upbeat pop song with gothic opera elements, which does well to highlight the series' overall focus on the darker aspects of the idol and acting industries. The song's lyrics are all about Ai, her role as an idol, and her true desire to love. Even more so, [[https://www.animenewsnetwork.com/interest/2023-06-07/oshi-no-ko-anime-opening-theme-song-idol-by-yoasobi-tops-billboard-global-excl-u.s-chart/.198875 the song became the first Japanese song and the first anime song to become the top song on Billboard Global (Excluding the US)]]. And during the Kohaku Uta Gassen 2023, [[https://streamable.com/68bjfa Yoasobi performed the song with several Jpop and Kpop idol groups as a huge celebration for pop music in Asia]]. [[https://www.youtube.com/watch?v=FEktA0Nmnjs Another version of "Idol"]] (sang by none other than Creator/RieTakahashi, Ai's Japanese VA) is equally popular, if not more so, even garnering ''over 6.5 million'' views within just '''''two weeks'''''.

** The opening song, [[https://www.youtube.com/watch?v=ZRtdQ81jPUQ "Idol"]] by Music/{{Yoasobi}}, is an upbeat pop song with gothic opera elements, which does well to highlight the series' overall focus on the darker aspects of the idol and acting industries. The song's lyrics are all about Ai, her role as an idol, and her true desire to love. Even more so, [[https://www.animenewsnetwork.com/interest/2023-06-07/oshi-no-ko-anime-opening-theme-song-idol-by-yoasobi-tops-billboard-global-excl-u.s-chart/.198875 the song became the first Japanese song and the first anime song to become the top song on Billboard Global (Excluding the US)]]. And during the Kohaku Uta Gassen 2023, [[https://streamable.com/68bjfa Yoasobi performed the song with several Jpop and Kpop idol groups as a huge celebration for pop music in Asia]]. [[https://www.youtube.com/watch?v=FEktA0Nmnjs The Ai Hoshino version of the song]] is equally popular, if not more so, even garnering ''over 6.5 million'' views within just '''''two weeks'''''.

** The opening song, [[https://www.youtube.com/watch?v=ZRtdQ81jPUQ "Idol"]] by Music/{{Yoasobi}}, is an upbeat pop song with gothic opera elements, which does well to highlight the series' overall focus on the darker aspects of the idol and acting industries. The song's lyrics are all about Ai, her role as an idol, and her true desire to love. Even more so, [[https://www.animenewsnetwork.com/interest/2023-06-07/oshi-no-ko-anime-opening-theme-song-idol-by-yoasobi-tops-billboard-global-excl-u.s-chart/.198875 the song became the first Japanese song and the first anime song to become the top song on Billboard Global (Excluding the US)]]. And during the Kohaku Uta Gassen 2023, [[https://streamable.com/68bjfa Yoasobi performed the song with several Jpop and Kpop idol groups as a huge celebration for pop music in Asia]]. [[https://www.youtube.com/watch?v=FEktA0Nmnjs The Ai Hoshino version of the song]] is equally popular, if not more so, even garnering ''over 6.5 million'' views on in just '''''two weeks'''''.

** The opening song, [[https://www.youtube.com/watch?v=ZRtdQ81jPUQ "Idol"]] by Music/{{Yoasobi}}, is an upbeat pop song with gothic opera elements, which does well to highlight the series' overall focus on the darker aspects of the idol and acting industries. The song's lyrics are all about Ai, her role as an idol, and her true desire to love. Even more so, [[https://www.animenewsnetwork.com/interest/2023-06-07/oshi-no-ko-anime-opening-theme-song-idol-by-yoasobi-tops-billboard-global-excl-u.s-chart/.198875 the song became the first Japanese song and the first anime song to become the top song on Billboard Global (Excluding the US)]]. And during the Kohaku Uta Gassen 2023, [[https://streamable.com/68bjfa Yoasobi performed the song with several Jpop and Kpop idol groups as a huge celebration for pop music in Asia]].

** ''Oshi no Ko'' has gotten increasing ire from fans/fanbases of more traditional idol anime and media series like ''Franchise/TheIdolmaster'' and ''Anime/LoveLive''. Most of it seems to stem from some ''Oshi no Ko'' fans tending to see ''Oshi no Ko''[='s=] depictions of idols (especially Ai and her notorious liar status) as the end-all be-all of what idols are like, frustrating fans of traditional idol media who feel that while ''Oshi no Ko'''s take on idols has truth to it in regards to the more negative practices of the real-life industry, the subject has more nuance and all depictions of idols shouldn't be painted with the same brush. On the other hand, several ''Oshi no Ko'' fans have asserted that several of these same franchises have openly accepted ''Oshi no Ko'' despite supposedly painting idols in the "wrong light", with several other works that also deconstructs the Idol industry such as 'VideoGame/BangDream'' and ''VideoGame/TheIdolmasterShinyColors'' outright collaborating with ''Oshi no Ko'' or adding the OP theme "Idol" to their songlists. Some of the debates about this can get vitriolic quickly over places such as Twitter.

** ''Oshi no Ko'' has gotten increasing ire from fans/fanbases of more traditional idol anime and media series like ''Franchise/TheIdolmaster'' and ''Anime/LoveLive''. Most of it seems to stem from some ''Oshi no Ko'' fans tending to see ''Oshi no Ko''[='s=] depictions of idols (especially Ai and her notorious liar status) as the end-all be-all of what idols are like, frustrating fans of traditional idol media who feel that while ''Oshi no Ko'''s take on idols has truth to it in regards to the more negative practices of the real-life industry, the subject has more nuance and all depictions of idols shouldn't be painted with the same brush. On the other hand, several ''Oshi no Ko'' fans have asserted that several of these same franchises have openly accepted ''Oshi no Ko'' despite supposedly painting idols in the "wrong light", with several other works that also deconstructs the Idol industry such as ''Franchise/BangDream'' and ''VideoGame/TheIdolmasterShinyColors'' outright collaborating with ''Oshi no Ko'' or adding the OP theme "Idol" to their songlists. Some of the debates about this can get vitriolic quickly over places such as Twitter.

** ''Oshi no Ko'' has gotten increasing ire from fans/fanbases of more traditional idol anime and media series like ''Franchise/TheIdolmaster'' and ''Anime/LoveLive''. Most of it seems to stem from some ''Oshi no Ko'' fans tending to see ''Oshi no Ko'''s depictions of idols (especially Ai and her notorious liar status) as the end-all be-all of what idols are like, frustrating fans of traditional idol media who feel that while ''Oshi no Ko'''s take on idols has truth to it in regards to the more negative practices of the real-life industry, the subject has more nuance and all depictions of idols shouldn't be painted with the same brush. On the other hand, several ''Oshi no Ko'' fans have asserted that several of these same franchises have openly accepted ''Oshi no Ko'' despite supposedly painting idols in the "wrong light", with several other works that also deconstructs the Idol industry such as ''Franchise/BangDream'' and ''VideoGame/TheIdolmasterShinyColors'' outright collaborating with ''Oshi no Ko'' or adding the OP theme "Idol" to their songlists. Some of the debates about this can get vitriolic quickly over places such as Twitter.

** "Oshi no Ko" has gotten increasing ire from fans/fanbases of more traditional idol anime and media series like ''Franchise/TheIdolmaster'' and ''Anime/LoveLive''. Most of it seems to stem from some Oshi no Ko fans tending to see Oshi no Ko's depictions of idols (especially Ai and her notorious liar status) as the end-all be-all of what idols are like, frustrating fans of traditional idol media who feel that while Oshi no Ko's take on idols has truth to it in regards to the more negative practices of the real-life industry, the subject has more nuance and all depictions of idols shouldn't be painted with the same brush. On the other hand, several Oshi no Ko fans have asserted that several of these same franchises have openly accepted Oshi no Ko despite supposedly painting idols in the "wrong light", with several ani-idol games such as ''Franchise/BangDream'' and ''VideoGame/TheIdolmasterShinyColors'' outright collaborating with Oshi no Ko or adding the OP theme "Idol" to their songlists. Some of the debates about this can get vitriolic quickly over places such as X/Twitter.

** There's quite the overlap between fans of this series and ''[[{{Manga/ActAge}} act-age]]'', especially after the latter's cancellation, which caused many to jump ship to this series due to its overlapping themes.

* FandomRivalry: It became the latest anime to get in the crosshairs of the more militant part of the ''Anime/FullmetalAlchemistBrotherhood'' fandom. ''FMAB'' fans have a track record of review bombing any anime that takes over the title of top-rated anime in [=MyAnimeList=], which they did in droves to ''Oshi No Ko'' after it took the spot following its acclaimed premiere. This has led ''Oshi no Ko'' fans on MAL to accuse detractors of being ''Brotherhood'' fans, whether or not they actually are.

* LesYay: There are various scenes in the series that some fans think shows an [[AmbiguouslyBi implication that Ruby is attracted to girls]]. For example, Ruby was openly ogling Minami and gushing over Frill when they first met, and she even had [[WingdingEyes a heart in her eye]] when talking about Frill. Not only that, but Ruby was incredibly happy about getting to breastfeed off of Ai, and as Sarina, she had [[WingdingEyes hearts in her eyes]] when talking about how cute Ai was. That being said, the only person she's ever explicitly had feelings for is [[spoiler:Goro, and one of her motivations for becoming an idol was to marry him someday]].

* LesYay: Ruby is shown to be just as much of a fangirl towards Frill as she is to Ai, and the first thing she notes about Minami is her large bust size.