History YMMV / D4DJ

** Lumina Ichihoshi [[spoiler:simply by virtue of being an A.I. who produces music]]. Some folks are put off by this and end up swearing off the franchise as, given the year that her neck of the main story was released and the fact that she's portrayed in a flattering light, it comes off as Bushiroad [[spoiler:implicitly siding with [[UsefulNotes/AIGeneratedArtwork A.I.-generated music and other arts]], something that has raised a lot of ethical questions in real life due to the potential for A.I. to replace human artists and some AI content generators infamously [[UsefulNotes/{{Plagiarism}} using human artists' content as training without those artists' permissions]]]]. Others feel like those critics are [[WhatDoYouMeanItsNotPolitical seeing a political statement that doesn't exist]] and just view Lumina as not much different from [[spoiler:the many other BenevolentAI characters written over the last several decades. Then there's a [[TakeAThirdOption third camp]] who simply feel that Lumina would be a more interesting character as a human than as a program.]]

** [[spoiler:The unknown blue-haired, yellow-eyed girl who invades various technology]] in "XROSS∞BEAT" Episode 1 is often referred to as [[spoiler:"Blumina"]].

** Weronika [[spoiler:grew up in a terribly impoverished neighborhood and couldn't even get a good education, and had to resort to cutthroat singing competitions and earning money off bets to provide for her siblings]], which explains why she's so competitive and brash towards others, even Neo who she sees as TheRival more than an ally.

** Weronika [[spoiler:grew up in a terribly impoverished neighborhood and couldn't even get a good education, and had to resort to cutthroat singing competitions and earning money off bets to provide for her siblings.]]

*** Rika Seto is either liked for being a bubbly and energetic girl who never lets setbacks bring her down too much, or disliked for not always thinking things through (in particular, her actions in the "side : nova -[=Merm4id=]-" event cause [[spoiler:their debut performance at what was supposed to be the unit's new home venue to end in a disastrous flooding]]) and dragging her "voice of reason" unitmate Saori into activities without her consent.

* FanficFuel: What exactly happened to Sophia in her childhood to [[spoiler:push her to [[DrivenToSuicide try to kill herself]]]]?

* TheWoobie: Abyssmare member Sophia suffers from some sort of deep depression, so bad that [[spoiler:when she was younger, she wanted to commit suicide. It was only through hearing Neo's singing during her attempt to plunge off the top of a building that she found a reason to live, which is why she's so devoted to Neo. Her depenence on Neo for her well-being is so bad that during season 7 of the side:nova story, when Neo is called away by Sho to watch [=UniChØrd=]'s performance, something that likely would not have taken more than an hour, she starts having a meltdown and needs to be calmed down by Weronika and Elsie.]]

** Noa Fukushima. Is her obsession with cute things, especially [[LesYay cute girls]], endearing lesbian repesentation? Or is her cute girl obsession a creepy and overdone component that reduces her to a one-note character who's nothing more than a [[StalkerWithACrush Stalker With Crushes]]?

** Lumina Ichihoshi [[spoiler:simply by virtue of being an A.I. who produces music]]. Some folks are put off by this and end up swearing off the franchise as, given the year that her neck of the main story was released and the fact that she's portrayed in a flattering light, it comes off as Bushiroad [[spoiler:implicitly siding with [[UsefulNotes/AIGeneratedArtwork A.I.-generated music and other arts]], something that has raised a lot of ethical questions in real life due to the potential for A.I. to replace human artists and some AI content generators infamously [[UsefulNotes/{{Plagiarism}} using human artists' content as training without those artists' permissions]]]]. Others feel like those critics are [[WhatDoYouMeanItsNotPolitical seeing a political statement that doesn't exist]] and just view Lumina as not much different from [[spoiler:the many other BenevolentAI characters written over the last several decades.]]

** The Summer Festival 2022 card featuring Rika and Saori wearing bikinis with the ''[=D4DJ=] Groovy Mix'' title written on their breasts, hugging and smiling proudly at the camera. You have people who absolutely eat this illustration up and often use it as a point against other idol games that don't have this kind of content, and there are those who feel that the existence of this card is an embarassment to the fandom and an example of SexSells gone too far.

* FandomRivalry: There is some between fans of [=D4DJ=] and fans of more popular rhythm games, such as ''Project SEKAI'', ''[=BanG=] Dream!'' and ''Ensemble Stars''. The main causes of this rivalry seem to be differing tastes in music, and the [=D4DJ=] art style not being favoured as much as the art style from other games. There's also some rivarly just due to the popularity other games have over [=D4DJ=]. Interestingly, a lot of this rivalry is one-sided, and many [=D4DJ=] players also play one or more of the other three games.

* FriendlyFandoms: Outside of the spaces where there is rivarly, [=D4DJ=] fans and [=Bang=] Dream! fans often get along, due to both franchises being Bushiroad properties.

*** Rika Seto is either liked for being a bubbly and energetic girl who never lets setbacks bring her down too much, or disliked for not always thinking things through (in particular, her actions in the "side : nova -[=Merm4id=]-" event cause [[spoiler:their debut performance at what was supposed to be the unit's new home venue to end in a disastrous flooding]]) dragging her "voice of reason" unitmate Saori into activities without her consent.

*** Rika Seto is either liked for being a bubbly and energetic girl who never lets setbacks bring her down too much, or disliked for not always thinking things through (in particular, her actions in the "side : nova -[=Merm4id=] dragging her "voice of reason" unitmate Saori into activities without her consent.

** Lumina Ichihoshi [[spoiler:simply by virtue of being an A.I. who produces music]]. Some folks are put off by this and end up swearing off the franchise as, given the year that her neck of the main story was released and the fact that she's portrayed in a flattering light, it comes off as Bushiroad [[spoiler:implicitly siding with A.I.-generated music and other arts, something that has raised a lot of ethical questions in real life due to the potential for A.I. to replace human artists and some AI content generators infamously [[UsefulNotes/{{Plagiarism}} using human artists' content as training without those artists' permissions]]]]. Others feel like those critics are [[WhatDoYouMeanItsNotPolitical seeing a political statement that doesn't exist]] and just view Lumina as not much different from [[spoiler:the many other BenevolentAI characters written over the last several decades.]]

* FandomRivalry: There is some between fans of [=D4DJ=] and fans of more popular rhythm games, such as ''Project SEKAI'', ''[=BanG=] Dream!'' and ''Ensemble Stars''. The main causes of this rivarly seem to be differing tastes in music, and the [=D4DJ=] art style not being favoured as much as the art style from other games. There's also some rivarly just due to the popularity other games have over [=D4DJ=]. Interestingly, a lot of this rivalry is one-sided, and many [=D4DJ=] players also play one or more of the other three games.

** Lumina Ichihoshi [[spoiler:simply by virtue of being an A.I. who produces music]]. Some folks are put off by this and end up swearing off the franchise as, given the year that her neck of the main story was released and the fact that she's portrayed in a flattering light, it comes off as Bushiroad [[spoiler:implicitly siding with A.I.-generated music and other arts, something that has raised a lot of ethical questions in real life due to the potential for A.I. to replace human artists and some AI content generators infamously [[UsefulNotes/{{Plagiarism}} using human artists' content as training without those artists' permissions]]]]. Others feel like those critics are [[WhatDoYouMeanItsNotPolitical seeing a political statement that doesn't exist]] and just view Lumina as not much different from [[spoiler:the many BenevolentAI characters written over the last several decades.]]

** Lumina Ichihoshi [[spoiler:simply by virtue of being an A.I. who produces music]]. Some folks are put off by this and end up swearing off the franchise as, given the year that her neck of the main story was released, it comes off as Bushiroad [[spoiler:implicitly siding with A.I.-generated music and other arts, something that has raised a lot of ethical questions in real life due to the potential for A.I. to replace human artists and some AI content generators infamously [[UsefulNotes/{{Plagiarism}} using human artists' content as training without those artists' permissions]]]]. Others feel like those critics are [[WhatDoYouMeanItsNotPolitical seeing a political statement that doesn't exist]] and just view Lumina as not much different from [[spoiler:the many BenevolentAI characters written over the last several decades.]]